This is the Unit .
The complete library can be download at :
http://sourceforge.net/projects/libnodave/ Thanks to all
// NoDaveComponent.pas
//
// A unit implementing a wrapper component for easy access to a S7-PLC with
// the libnodave.dll of Thomas Hergenhahn (
http://libnodave.sourceforge.net)
//
// (C) 2005, 2006 Gebr. Schmid GmbH + Co., Freudenstadt, Germany
//
// Author: Axel Kinting (akinting@schmid-online.de)
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this library; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
{$IFDEF FPC}
{$MODE Delphi}
{$ENDIF}
unit NoDaveComponent;
//The Unit NoDaveComponent implements the class TNoDave, which encapsulates the access to the libnodave.dll.
//With TNoDave and libnodave.dll it is very easy to read and write data from and to a S7 PLC.
//Simatic, Simatic S5, Simatic S7, S7-200, S7-300, S7-400 are registered Trademarks of Siemens Aktiengesellschaft, Berlin und Muenchen.
//~Author Axel Kinting - Gebr. Schmid GmbH + Co.
//~todo Before Installation:
//Please copy the file \pascal\nodave.pas into the directory, where the file nodavecomponent.pas is located !
//Delphi-Installation:
//1. Select Component - Install in the Delphi-menu
//2. Select Add... button
//3. Select Browse
//4. Select NoDaveComponent.pas
//5. Select OK
//Lazarus-Installation:
//1. Select Components - Open package file
//2. Select nodavepackage.lpk
//3. Select Open
//4. Select Compile
//5. Select Install
//6. Select Yes
interface
uses
SysUtils, Classes, NoDave, SyncObjs, Controls, {$IFDEF FPC} LCLIntf, LResources {$ELSE} Windows {$ENDIF};
type
TNoDaveArea = ( //The area of the PLC-Data for the TNoDave-Component.
daveSysInfo, //System information of 200 family
daveSysFlags, //System flag area of 200 family
daveAnaIn, //Analog input words of 200 family
daveAnaOut, //Analog output words of 200 family
daveInputs, //Input memory image
daveOutputs, //Output memory image
daveFlags, //Flags/Markers
daveDB, //Data Blocks (global data)
daveDI, //Data Blocks (instance data) ?
daveLocal, //Data Blocks (local data) ?
daveV, //unknown Area
daveCounter, //Counter
daveTimer, //Timer
daveP //Peripherie Input/Output
);
TNoDaveDebugOption = ( //The debug-options for the libnodave.dll
daveDebugRawRead,
daveDebugSpecialChars,
daveDebugRawWrite,
daveDebugListReachables,
daveDebugInitAdapter,
daveDebugConnect,
daveDebugPacket,
daveDebugByte,
daveDebugCompare,
daveDebugExchange,
daveDebugPDU,
daveDebugUpload,
daveDebugMPI,
daveDebugPrintErrors,
daveDebugPassive
);
TNoDaveDebugOptions = Set of TNoDaveDebugOption;
TNoDaveProtocol = ( //The type of the communication-protocol for the TNoDave-Component.
daveProtoMPI, //MPI-Protocol
daveProtoMPI2, //MPI-Protocol (Andrew's version without STX)
daveProtoMPI3, //MPI-Protocol (Step 7 Version version)
daveProtoMPI4, //MPI-Protocol (Andrew's version with STX)
daveProtoPPI, //PPI-Protocol
daveProtoISOTCP, //ISO over TCP
daveProtoISOTCP243, //ISO over TCP (for CP243)
daveProtoIBH, //IBH-Link TCP/MPI-Adapter
daveProtoIBH_PPI, //IBH-Link TCP/MPI-Adapter with PPI-Protocol
daveProtoS7Online, //use S7Onlinx.dll for transport via Siemens CP
daveProtoAS511, //S5 via programmer-port
daveProtoNLPro //Deltalogic NetLink-PRO TCP/MPI-Adapter
);
TNoDaveSpeed = ( //The speed of the MPI-protocol for the TNoDave-Component.
daveSpeed9k,
daveSpeed19k,
daveSpeed187k,
daveSpeed500k,
daveSpeed1500k,
daveSpeed45k,
daveSpeed93k
);
TNoDaveComSpeed = ( //The speed of the COM-Port for the TNoDave-Component.
daveComSpeed9_6k,
daveComSpeed19_2k,
daveComSpeed38_4k,
daveComSpeed57_6k,
daveComSpeed115_2k
);
//This is the type of the Event-Handler for the OnError-Event of the TNoDave component.
//~param Sender The TNoDave-instance which is the source of the event.
//~param ErrorMsg A clear text message describing the error.
TNoDaveOnErrorEvent = procedure(Sender: TObject; ErrorMsg: String) of Object;
//List of reachable Partners in the MPI-Network, True = Station is available at this address.
TNoDaveReachablePartnersMPI = Array [0..126] of Boolean;
//The Class TNoDave encapsulates the access to the libnodave.dll of Thomas Hergenhahn.
//All the settings for the communication are available in the properties of TNoDave.
TNoDave = class(TComponent)
private
FActive: Boolean;
FArea: TNoDaveArea;
FBuffer: Pointer;
FBufLen: Integer;
FBufOffs: Integer;
FComPort: String;
FCpuRack: Integer;
FCpuSlot: Integer;
FCycleTime: Cardinal;
FDBNumber: Integer;
FDebugOptions: Integer;
FInterval: Cardinal;
FIntfName: String;
FIntfTimeout: Integer;
FIPAddress: String;
FIPPort: Integer;
FMPILocal: Integer;
FMPIRemote: Integer;
FMPISpeed: TNoDaveSpeed;
FLastError: Integer;
FOnConnect: TNotifyEvent;
FOnDisconnect: TNotifyEvent;
FOnError: TNoDaveOnErrorEvent;
FOnRead: TNotifyEvent;
FOnWrite: TNotifyEvent;
FProtocol: TNoDaveProtocol;
FSZLBuffer: Pointer;
FComSpeed: TNoDaveComSpeed;
FHandle: THandle;
function GetActive: Boolean;
function GetBuffer: String;
function GetDebugOptions: TNoDaveDebugOptions;
function GetLastErrMsg: String;
procedure SetActive(V: Boolean);
procedure SetArea(V: TNoDaveArea);
procedure SetBufLen(V: Integer);
procedure SetBufOffs(V: Integer);
procedure SetComPort(V: String);
procedure SetCpuRack(V: Integer);
procedure SetCpuSlot(V: Integer);
procedure SetDBNumber(V: Integer);
procedure SetDebugOptions(V: TNoDaveDebugOptions);
procedure SetInterval(V: Cardinal);
procedure SetIntfName(V: String);
procedure SetIntfTimeout(V: Integer);
procedure SetIPAddress(V: String);
procedure SetIPPort(V: Integer);
procedure SetMPILocal(V: Integer);
procedure SetMPIRemote(V: Integer);
procedure SetMPISpeed(V: TNoDaveSpeed);
procedure SetProtocol(V: TNoDaveProtocol);
function GetSZLCount: Integer;
function GetSZLItemSize: Integer;
function GetSZLItem(Index: Integer): Pointer;
function GetMaxPDUData: Integer;
procedure SetComSpeed(V: TNoDaveComSpeed);
function GetHandle: THandle;
protected
ConnectPending: Boolean;
DaveFDS: _daveOSSerialType;
DaveConn: PDaveConnection;
DaveIntf: PDaveInterface;
LockNoDave: TCriticalSection;
ReadThread: TThread;
procedure DoConnect(OnlyIntf: Boolean = False);
procedure DoOnConnect;
procedure DoOnDisconnect;
procedure DoOnError(ErrorMsg: String);
procedure DoOnRead;
procedure DoOnWrite;
procedure DoReadBytes(Area: TNoDaveArea; DB, Start, Size: Integer; Buffer: Pointer = Nil);
procedure DoWriteBytes(Area: TNoDaveArea; DB, Start, Size: Integer; Buffer: Pointer = Nil);
procedure DoWriteValue(Address, Size: Integer; Value: Pointer);
procedure Loaded; override;
procedure WriteBit(Area: TNoDaveArea; DB, Address, Bit: Integer; Value: Boolean); overload;
function AreaCode(Area: TNoDaveArea): Integer;
function ProtCode(Prot: TNoDaveProtocol): Integer;
function BufferAt(Address: Integer; Size: Integer = 1; Buffer: Pointer = Nil; BufOffs: Integer = 0; BufLen: Integer = 0): Pointer;
public
AreaID: Integer; //S7-ID of the selected ~[link .Area Area]
constructor Create(aOwner: TComponent); override;
destructor Destroy; override;
procedure Connect(Wait: Boolean = True);
procedure Disconnect;
procedure Lock;
procedure Unlock;
procedure ResetInterface;
procedure DoSetDebug(Options: Integer);
procedure ReadBytes(Buffer: Pointer = Nil); overload;
Procedure WriteBytes(Buffer: Pointer = Nil); overload;
procedure ReadBytes(Area: TNoDaveArea; DB, Start, Size: Integer; Buffer: Pointer = Nil); overload;
procedure WriteBytes(Area: TNoDaveArea; DB, Start, Size: Integer; Buffer: Pointer = Nil); overload;
procedure WriteBit(Address, Bit: Integer; Value: Boolean); overload;
procedure WriteByte(Address: Integer; Value: Byte);
procedure WriteWord(Address: Integer; Value: Word);
procedure WriteInt(Address: Integer; Value: SmallInt);
procedure WriteDWord(Address: Integer; Value: LongWord);
procedure WriteDInt(Address: Integer; Value: LongInt);
procedure WriteFloat(Address: Integer; Value: Single);
function GetBit(Address, Bit: Integer; Buffer: Pointer = Nil; BufOffs: Integer = 0; BufLen: Integer = 0): Boolean;
function GetByte(Address: Integer; Buffer: Pointer = Nil; BufOffs: Integer = 0; BufLen: Integer = 0): Byte;
function GetWord(Address: Integer; Buffer: Pointer = Nil; BufOffs: Integer = 0; BufLen: Integer = 0): Word;
function GetInt(Address: Integer; Buffer: Pointer = Nil; BufOffs: Integer = 0; BufLen: Integer = 0): SmallInt;
function GetDWord(Address: Integer; Buffer: Pointer = Nil; BufOffs: Integer = 0; BufLen: Integer = 0): LongWord;
function GetDInt(Address: Integer; Buffer: Pointer = Nil; BufOffs: Integer = 0; BufLen: Integer = 0): LongInt;
function GetFloat(Address: Integer; Buffer: Pointer = Nil; BufOffs: Integer = 0; BufLen: Integer = 0): Double;
function GetDBSize(DB: Integer): Integer;
function ListReachablePartners: TNoDaveReachablePartnersMPI;
function Swap16(Value: SmallInt): SmallInt;
function Swap32(Value: Integer): Integer;
function GetErrorMsg(Error: Integer): String;
function ReadSZL(ID, Index: Integer): Integer;
property SZLCount: Integer read GetSZLCount; //Property for the number of items in the internal SZL-Buffer
property SZLItem[Index: Integer]: Pointer read GetSZLItem; //Property for the items in the internal SZL-Buffer
property SZLItemSize: Integer read GetSZLItemSize; //Property for the size of one item in the internal SZL-Buffer
property MaxPDUData: Integer read GetMaxPDUData; //Property for the maximum datasize of one read-request
property Handle: THandle read GetHandle; //Property for the Windows-Handle used for system-calls
published
property Active: Boolean read GetActive write SetActive; //Property for the connection-status.
property Area: TNoDaveArea read FArea write SetArea; //Property for the PLC-area
property Buffer: String read GetBuffer; //Property for the pointer to the internal buffer memory.
property BufLen: Integer read FBufLen write SetBufLen; //Property for the length of the buffer.
property BufOffs: Integer read FBufOffs write SetBufOffs; //Property for the offset of the buffer within the address-range of the PLC.
property COMPort: String read FComPort write SetComPort; //Property for the name of the COM-Port used for the serial-to-MPI adapter.
property COMSpeed: TNoDaveComSpeed read FComSpeed write SetComSpeed; //Property for the speed of the COM-Port used for the serial-to-MPI adapter.
property CPURack: Integer read FCpuRack write SetCpuRack; //Property for the number of the rack containing the CPU of the PLC.
property CPUSlot: Integer read FCpuSlot write SetCpuSlot; //Property for the number of the slot containing the CPU of the PLC.
property CycleTime: Cardinal read FCycleTime; //Property for the duration in ms of the last communication cycle.
property DBNumber: Integer read FDBNumber write SetDBNumber; //Property for the number of the datablock in the PLC.
property DebugOptions: TNoDaveDebugOptions read GetDebugOptions write SetDebugOptions; //Property for the debug-options.
property Interval: Cardinal read FInterval write SetInterval; //Property for the minimal round-trip cycle time for the background-communication with the PLC in milliseconds.
property IntfName: String read FIntfName write SetIntfName; //Property for the symbolic name of the interface.
property IntfTimeout: Integer read FIntfTimeout write SetIntfTimeout; //Property for the timeout of the interface in milliseconds.
property IPAddress: String read FIPAddress write SetIPAddress; //Property for the IP-address or name of the TCP/IP partner station.
property IPPort: Integer read FIPPort write SetIPPort; //Property for the IP-port of the TCP/IP partner station.
property LastError: Integer read FLastError; //Property for the return-code of the last call of a communication-method.
property LastErrMsg: String read GetLastErrMsg; //Property for the text describing the code in ~[link .LastError LastError].
property MPILocal: Integer read FMPILocal write SetMPILocal; //Property for the local MPI-address used for the MPI-communication.
property MPIRemote: Integer read FMPIRemote write SetMPIRemote; //Property for the remote MPI-address used for the MPI-communication.
property MPISpeed: TNoDaveSpeed read FMPISpeed write SetMPISpeed; //Property for the MPI-speed used for the MPI-communication.
property OnConnect: TNotifyEvent read FOnConnect write FOnConnect; //Property for the OnConnect-eventhandler
property OnDisconnect: TNotifyEvent read FOnDisconnect write FOnDisconnect; //Property for the OnDisconnect-eventhandler
property OnError: TNoDaveOnErrorEvent read FOnError write FOnError; //Property for the OnError-eventhandler
property OnRead: TNotifyEvent read FOnRead write FOnRead; //Property for the OnRead-eventhandler
property OnWrite: TNotifyEvent read FOnWrite write FOnWrite; //Property for the OnWrite-eventhandler
property Protocol: TNoDaveProtocol read FProtocol write SetProtocol; //Property for the Protocol used for the communication with the PLC.
end;
TSzlLed = (NONE, SF, INTF, EXTF, RUN, STOP, FRCE, CRST, BAF, USR, USR1, BUS1F, BUS2F, REDF, MSTR, RACK0, RACK1, RACK2, IFM1F, IFM2F);
TSzlBGIdent = Record
Index: Word;
MlfB: packed Array[1..20] of Char;
BGTyp: Word;
AusBG: packed Array[1..4] of Byte;
end;
PSzlBGIdent = ^TSzlBGIdent;
TSzlUserMemory = Record
Index: Word;
Code: Word;
Size: LongWord;
Mode: Word;
Granu: Word;
Area1: LongWord;
Used1: LongWord;
Free1: LongWord;
Area2: LongWord;
Used2: LongWord;
Free2: LongWord;
end;
PSzlUserMemory = ^TSzlUserMemory;
TSzlSystemMemory = Record
Index: Word;
Code: Word;
Count: Word;
Reman: Word;
end;
PSzlSystemMemory = ^TSzlSystemMemory;
TSzlBlockType = Record
Index: Word;
Count: Word;
Size: Word;
MemSize: LongWord;
end;
PSzlBlockType = TSzlBlockType;
TSzlLedState = packed Record
Index: Word;
State: Byte;
Blink: Byte;
end;
PSzlLedState = ^TSzlLedState;
TSzlBGState = Record
Addr1: Word;
Addr2: Word;
LogAddr: Word;
ConfTyp: Word;
RealTyp: Word;
Count: Word;
EAStatus: Word;
Area: Word;
end;
PSzlBGState = ^TSzlBGState;
TSzlStationState = Record
Status: packed Array[0..15] of Byte;
end;
PSzlStationState = ^TSzlStationState;
TSzlDiagMessage = packed Record
ID: Word;
Info: Array[1..5] of Word;
Year: Byte;
Month: Byte;
Day: Byte;
Hour: Byte;
Minute: Byte;
Second: Byte;
MSec: Word;
end;
PSzlDiagMessage = ^TSzlDiagMessage;
TSzlBGDiagInfo = Record
Info: packed Array[1..4] of Byte;
end;
PSzlBGDiagInfo = ^TSzlBGDiagInfo;
procedure Register;
implementation
type
//Worker-thread for asynchronous connecting with the PLC.
TNoDaveConnectThread = class(TThread)
private
NoDave: TNoDave;
ErrMsg: String;
protected
procedure DoOnError;
procedure DoOnConnect;
procedure Execute; override;
public
constructor Create(Target: TNoDave);
end;
//Worker-thread for the background-communication with the PLC.
TNoDaveReadThread = class(TThread)
private
NoDave: TNoDave;
ErrMsg: String;
protected
procedure DoOnError;
procedure DoOnRead;
procedure Execute; override;
public
constructor Create(Target: TNoDave);
end;
//Installation of TNoDave in the component palette
procedure Register;
begin
RegisterComponents('System',[TNoDave]);
end;
{ TNoDaveConnectThread }
//Create the worker-thread for asynchronous connecting with the PLC.
//~param Target The TNoDave-instance to connect with the PLC.
constructor TNoDaveConnectThread.Create(Target: TNoDave);
begin
inherited Create(False);
NoDave:=Target;
FreeOnTerminate:=True;
end;
//Synchronization-method for calling the OnConnect-Event of the TNoDave-instance.
procedure TNoDaveConnectThread.DoOnConnect;
begin
NoDave.DoOnConnect;
end;
//Synchronization-method for calling the OnError-Event of the TNoDave-instance.
procedure TNoDaveConnectThread.DoOnError;
begin
NoDave.DoOnError(ErrMsg);
end;
//Open the connection to the PLC. If successfull then call the OnConnect-Event else call the OnError-Event of the TNoDave-instance.
procedure TNoDaveConnectThread.Execute;
begin
try
NoDave.DoConnect;
If NoDave.Active then Synchronize(DoOnConnect);
except
on E: Exception do
begin
ErrMsg:='Error in function TNoDaveConnectThread.Execute: ' + E.Message;
Synchronize(DoOnError);
end;
end;
NoDave.ConnectPending:=False;
end;
{ TNoDaveReadThread }
//Create the worker-thread for the background-communication with the PLC.
//~param Target The TNoDave-instance for the communication with the PLC.
constructor TNoDaveReadThread.Create(Target: TNoDave);
begin
inherited Create(False);
NoDave:=Target;
end;
//Synchronization-method for calling the OnError-Event of the TNoDave-instance.
procedure TNoDaveReadThread.DoOnError;
begin
NoDave.DoOnError(ErrMsg);
end;
//Synchronization-method for calling the OnRead-Event of the TNoDave-instance.
procedure TNoDaveReadThread.DoOnRead;
begin
NoDave.DoOnRead;
end;
//Read the data from the PLC, call the OnRead-Event of the TNoDave-instance, wait until the round-trip cycle time is reached and
//then start again from the beginning until the Connection of the TNoDave-instance is active. Disconnect the TNoDave-instance if
//the connection is not longer valid.
procedure TNoDaveReadThread.Execute;
var
StartTime: Cardinal;
NextTime: Cardinal;
begin
While NoDave.Active and (NoDave.Interval > 0) do
begin
StartTime:=GetTickCount;
NextTime:=StartTime + NoDave.Interval;
try
NoDave.ReadBytes;
If NoDave.LastError = 0 then Synchronize(DoOnRead) else
begin
If NoDave.LastError = -1 then NoDave.Disconnect else
begin
ErrMsg:=NoDave.LastErrMsg;
Synchronize(DoOnError);
end;
end;
except
on E: Exception do
begin
ErrMsg:='Error in function TNoDaveReadThread.Execute: ' + E.Message;
Synchronize(DoOnError);
end;
end;
While GetTickCount < NextTime do Sleep(1);
end;
end;
{ TNoDave }
//Initialize a new instance of the TNoDave component.
//~param aOwner Owner of the created instance.
constructor TNoDave.Create(aOwner: TComponent);
begin
inherited;
AreaID:=-1;
FActive:=False;
FArea:=daveDB;
FBuffer:=Nil;
FBufLen:=0;
FBufOffs:=0;
FComPort:='COM1:';
FComSpeed:=daveComSpeed38_4k;
FCpuRack:=0;
FCpuSlot:=2;
FDBNumber:=1;
FDebugOptions:=0;
FIntfName:='IF1';
FIntfTimeout:=1500000;
FIPAddress:='';
FIPPort:=102;
FMPILocal:=0;
FMPIRemote:=2;
FMPISpeed:=daveSpeed187k;
FLastError:=0;
FProtocol:=daveProtoMPI;
LockNoDave:=TCriticalSection.Create;
daveSetDebug(FDebugOptions);
end;
//Close an active connection and call the inherited Destroy method.
destructor TNoDave.Destroy;
begin
Disconnect;
If Assigned(FBuffer) then
try
FreeMem(FBuffer);
except
end;
If FHandle <> 0 then
try
DeallocateHWnd(FHandle);
except
end;
FHandle:=0;
LockNoDave.Free;
inherited;
end;
//Determine the S7-ID of an Area.
//~param Area Requested Area.
//~result S7-ID of the Area.
function TNoDave.AreaCode(Area: TNoDaveArea): Integer;
begin
Result:=AreaID;
If Result = -1 then
begin
Case Area of
daveSysInfo: Result:=3;
daveSysFlags: Result:=5;
daveAnaIn: Result:=6;
daveAnaOut: Result:=7;
daveCounter: Result:=28;
daveTimer: Result:=29;
daveP: Result:=128;
daveInputs: Result:=129;
daveOutputs: Result:=130;
daveFlags: Result:=131;
daveDB: Result:=132;
daveDI: Result:=133;
daveLocal: Result:=134;
daveV: Result:=135;
end;
end;
end;
//Return a Pointer to the requested PLC-data point within the buffer.
//~param Address PLC-Address of the datapoint.
//~param Size Size of the datapoint in bytes.
//~param Buffer Pointer to the buffer holding the PLC-data. The internal buffer is used, if Nil (default).
//~param BufOffs Offset-address of the buffer within the address-range of the PLC.
//~param BufLen Length of the buffer in bytes.
//~result Pointer to the requested data point if the address is located in the buffer, else Nil.
function TNoDave.BufferAt(Address: Integer; Size: Integer; Buffer: Pointer; BufOffs: Integer; BufLen: Integer): Pointer;
var
Offset: Integer;
begin
Result:=Nil;
try
If Assigned(Buffer) then
begin
Offset:=Address - BufOffs;
If Offset + Size <= BufLen then Result:=Pointer(Integer(Buffer) + Offset);
end else begin
Offset:=Address - FBufOffs;
If Offset + Size <= FBufLen then Result:=Pointer(Integer(FBuffer) + Offset);
end;
except
On E: Exception do DoOnError('Error in function TNoDave.BufferAt(' + IntToStr(Address) + ', ' + IntToStr(Size) + ', $' +
IntToHex(Integer(Buffer), 8) + ', ' + IntToStr(BufOffs) + ', ' + IntToStr(BufLen) + '): ' +
E.Message);
end;
end;
//Open the connection to the PLC.
//~param Wait If False the connection is opened asyncronous in a separate thread. Default is True.
procedure TNoDave.Connect(Wait: Boolean = True);
begin
If not FActive and not ConnectPending then
begin
ConnectPending:=True;
If Wait then
begin
try
DoConnect;
If Active and not (csLoading in ComponentState) then DoOnConnect;
except
On E: Exception do DoOnError('Error in function TNoDave.Connect: ' + E.Message);
end;
ConnectPending:=False;
end else begin
TNoDaveConnectThread.Create(Self);
end;
end;
end;
//Close the connection to the PLC.
procedure TNoDave.Disconnect;
begin
If Active then
begin
try
daveDisconnectPLC(DaveConn);
daveFree(DaveConn);
daveDisconnectAdapter(DaveIntf);
daveFree(DaveIntf);
If FProtocol <> daveProtoS7Online then closePort(DaveFDS.rfd) else closeS7online(DaveFDS.rfd);
except
On E: Exception do DoOnError('Error in function TNoDave.Disconnect: ' + E.Message);
end;
FActive:=False;
DoOnDisconnect;
end;
end;
//Open the connection to the PLC specified by the properties ~[link .Protocol Protocol], ~[link .CPURack CPURack], ~[link .CPUSlot CPUSlot],
//~[link .COMPort COMPort], ~[link .IPAddress IPAddress], ~[link .IPPort IPPort], ~[link .MPILocal MPILocal], ~[link .MPIRemote MPIRemote]
// and/or ~[link .MPISpeed MPISpeed]
//~param OnlyIntf Open only the interface, don't connect to the PLC
procedure TNoDave.DoConnect(OnlyIntf: Boolean = False);
var
Address: String;
Speed: PChar;
begin
If not FActive then
begin
If not (csLoading in ComponentState) then
begin
Case FProtocol of
daveProtoMPI, daveProtoMPI2, daveProtoMPI3, daveProtoMPI4, daveProtoPPI, daveProtoAS511:
begin
Address:=FComPort + #0;
Case ComSpeed of
daveComSpeed9_6k: Speed:='9600';
daveComSpeed19_2k: Speed:='19200';
daveComSpeed38_4k: Speed:='38400';
daveComSpeed57_6k: Speed:='57600';
daveComSpeed115_2k: Speed:='115200';
else Speed:='38400';
end;
DaveFDS.rfd:=SetPort(@Address[1], Speed, 'O');
end;
daveProtoISOTCP, daveProtoISOTCP243, daveProtoIBH, daveProtoIBH_PPI, daveProtoNLPro:
begin
Address:=FIPAddress + #0;
DaveFDS.rfd:=OpenSocket(FIPPort, @Address[1]);
end;
daveProtoS7Online:
begin
Address:=FComPort + #0;
DaveFDS.rfd:=OpenS7Online(@Address[1], Handle);
end;
end;
DaveFDS.wfd:=DaveFDS.rfd;
If (DaveFDS.rfd > 0) or ((DaveFDS.rfd = 0) and (FProtocol = daveProtoS7Online)) then
begin
Address:=FIntfName + #0;
DaveIntf:=daveNewInterface(DaveFDS, @Address[1], Ord(FMPIlocal), ProtCode(FProtocol), Ord(FMPISpeed));
DaveIntf^.timeout:=FIntfTimeout;
If not OnlyIntf then
begin
FLastError:=daveInitAdapter(DaveIntf);
If FLastError = 0 then
begin
DaveConn:=daveNewConnection(DaveIntf, FMPIRemote, FCpuRack, FCpuSlot);
FLastError:=daveConnectPLC(DaveConn);
FActive:=(FLastError = 0);
If Active then ReadBytes else DoOnError(daveStrerror(FLastError));
end;
end;
end;
end else FActive:=True;
end;
end;
//Create the worker-thread for cyclic reading if neccessary and call the OnConnect-eventhandler if specified.
procedure TNoDave.DoOnConnect;
begin
If (FInterval > 0) and not Assigned(ReadThread) and not (csDesigning in ComponentState)
then ReadThread:=TNoDaveReadThread.Create(Self);
If Assigned(OnConnect) then OnConnect(Self);
end;
//Stop and Destroy the worker-thread for cyclic reading if neccessary and call the OnDisconnect-eventhandler if specified.
procedure TNoDave.DoOnDisconnect;
begin
If Assigned(ReadThread) then
begin
ReadThread.WaitFor;
FreeAndNil(ReadThread);
end;
If Assigned(OnDisconnect) then OnDisconnect(Self);
end;
//Call the OnError-eventhandler if specified.
//~param ErrorMsg The text-message for the OnError-event
procedure TNoDave.DoOnError(ErrorMsg: String);
begin
If Assigned(OnError) then OnError(Self, ErrorMsg);
end;
//Call the OnRead-eventhandler if specified.
procedure TNoDave.DoOnRead;
begin
If Assigned(OnRead) then OnRead(Self);
end;
//Call the OnWrite-eventhandler if specified.
procedure TNoDave.DoOnWrite;
begin
If Assigned(OnWrite) then OnWrite(Self);
end;
//Read the PLC-data into the buffer.
//~param Area Requested PLC-area.
//~param DB Number of requested datablock. Only used, if reading from Datablocks in the PLC.
//~param Start Start-address of the requested data within the address-range of the PLC.
//~param Size Length of the requested PLC-data in bytes.
//~param Buffer Pointer to the buffer. The internal buffer of the instance is used, if Nil (default).
procedure TNoDave.DoReadBytes(Area: TNoDaveArea; DB, Start, Size: Integer; Buffer: Pointer);
var
Index, Length, MaxLen: Integer;
StartTime: Cardinal;
begin
Index:=0;
StartTime:=GetTickCount;
MaxLen:=MaxPDUData;
While (Index < Size) and (MaxLen > 0) do
begin
Length:=(Size - Index);
If Length > MaxLen then Length:=MaxLen;
try
LockNoDave.Enter;
FLastError:=daveReadBytes(DaveConn, AreaCode(Area), DB, Index+Start, Size, Pointer(Integer(Buffer) + Index));
except
On E: Exception do DoOnError('Error in function TNoDave.DoReadBytes: ' + E.Message);
end;
LockNoDave.Leave;
Inc(Index, Length);
end;
try
FCycleTime:=GetTickCount - StartTime;
except
end;
end;
//Write the Buffer-data into the PLC.
//~param Area Requested PLC-area.
//~param DB Number of requested datablock. Only used, if reading from Datablocks in the PLC.
//~param Start Start-address of the requested data within the address-range of the PLC.
//~param Size Length of the requested PLC-data in bytes.
//~param Buffer Pointer to the buffer. The internal buffer of the instance is used, if Nil (default).
procedure TNoDave.DoWriteBytes(Area: TNoDaveArea; DB, Start, Size: Integer; Buffer: Pointer);
var
Index, Length, MaxLen: Integer;
begin
Index:=0;
MaxLen:=MaxPDUData-4;
While (Index < Size) and (MaxLen > 0) do
begin
Length:=(Size - Index);
If Length > MaxLen then Length:=MaxLen;
try
LockNoDave.Enter;
FLastError:=daveWriteBytes(DaveConn, AreaCode(Area), DB, Index+Start, Size, Pointer(Integer(Buffer) + Index));
except
On E: Exception do DoOnError('Error in function TNoDave.DoWriteBytes: ' + E.Message);
end;
LockNoDave.Leave;
Inc(Index, Length);
end;
end;
//Write a single value into the specified address of the PLC without changing the properties of the TNoDave-instance.
//~param Address PLC-Address of the data point.
//~param Size Size in bytes of the value.
//~param Value The value to be written.
procedure TNoDave.DoWriteValue(Address, Size: Integer; Value: Pointer);
begin
try
LockNoDave.Enter;
FLastError:=daveWriteBytes(DaveConn, AreaCode(FArea), FDBNumber, Address, Size, Value);
except
On E: Exception do DoOnError('Error in function TNoDave.DoWriteValue: ' + E.Message);
end;
LockNoDave.Leave;
end;
//Set the debug-options of the libnodave.dll
//~param Options Value of the debug-options.
procedure TNoDave.DoSetDebug(Options: Integer);
begin
daveSetDebug(Options);
FDebugOptions:=Options;
end;
//Return the state of the connection to the PLC.
//~result True, if connection is open, else False.
function TNoDave.GetActive: Boolean;
begin
Result:=FActive and not (csLoading in ComponentState);
end;
//Return a textual representation of the content of the internal buffer.
//~result String with the hexadecimal value of the bytes in the buffer.
function TNoDave.GetBuffer: String;
var
Index: Integer;
Value: Byte;
begin
Result:='';
If Assigned(FBuffer) then
begin
Index:=0;
While Index < FBufLen do
begin
Value:=Byte(Pointer(Integer(FBuffer) + Index)^);
If Result <> '' then Result:=Result + ' ';
Result:=Result + IntToHex(Value, 2);
Inc(Index);
end;
end;
end;
//Return the Bit-value read last from the PLC at the specified address.
//~param Address Byte-address of the requested value
//~param Bit Bit-address of the requested value
//~param Buffer Pointer to the buffer holding the PLC-data. The internal buffer is used, if Nil (default).
//~param BufOffs Offset-address of the buffer within the address-range of the PLC.
//~param BufLen Length of the buffer in bytes.
//~result The requested value or False, if the requested address was not found within the buffer.
function TNoDave.GetBit(Address, Bit: Integer; Buffer: Pointer; BufOffs: Integer; BufLen: Integer): Boolean;
var
BufPtr: Pointer;
begin
BufPtr:=BufferAt(Address, 1, Buffer, BufOffs, BufLen);
If Assigned(BufPtr) then Result:=(daveGetU8From(BufPtr) and (1 shl Bit)) <> 0 else Result:=False;
end;
//Return the Byte-value read last from the PLC at the specified address.
//~param Address Address of the requested value
//~param Buffer Pointer to the buffer holding the PLC-data. The internal buffer is used, if Nil (default).
//~param BufOffs Offset-address of the buffer within the address-range of the PLC.
//~param BufLen Length of the buffer in bytes.
//~result The requested value or 0, if the requested address was not found within the buffer.
function TNoDave.GetByte(Address: Integer; Buffer: Pointer; BufOffs: Integer; BufLen: Integer): Byte;
var
BufPtr: Pointer;
begin
BufPtr:=BufferAt(Address, 1, Buffer, BufOffs, BufLen);
If Assigned(BufPtr) then Result:=daveGetU8From(BufPtr) else Result:=0;
end;
//Return the LongInt-value read last from the PLC at the specified address.
//~param Address Address of the requested value
//~param Buffer Pointer to the buffer holding the PLC-data. The internal buffer is used, if Nil (default).
//~param BufOffs Offset-address of the buffer within the address-range of the PLC.
//~param BufLen Length of the buffer in bytes.
//~result The requested value or 0, if the requested address was not found within the buffer.
function TNoDave.GetDInt(Address: Integer; Buffer: Pointer; BufOffs: Integer; BufLen: Integer): LongInt;
var
BufPtr: Pointer;
begin
BufPtr:=BufferAt(Address, 4, Buffer, BufOffs, BufLen);
If Assigned(BufPtr) then Result:=daveGetS32From(BufPtr) else Result:=0;
end;
//Return the LongWord-value read last from the PLC at the specified address.
//~param Address Address of the requested value
//~param Buffer Pointer to the buffer holding the PLC-data. The internal buffer is used, if Nil (default).
//~param BufOffs Offset-address of the buffer within the address-range of the PLC.
//~param BufLen Length of the buffer in bytes.
//~result The requested value or 0, if the requested address was not found within the buffer.
function TNoDave.GetDWord(Address: Integer; Buffer: Pointer; BufOffs: Integer; BufLen: Integer): LongWord;
var
BufPtr: Pointer;
begin
BufPtr:=BufferAt(Address, 4, Buffer, BufOffs, BufLen);
If Assigned(BufPtr) then Result:=daveGetU32From(BufPtr) else Result:=0;
end;
//Return the Float-value read last from the PLC at the specified address.
//~param Address Address of the requested value
//~param Buffer Pointer to the buffer holding the PLC-data. The internal buffer is used, if Nil (default).
//~param BufOffs Offset-address of the buffer within the address-range of the PLC.
//~param BufLen Length of the buffer in bytes.
//~result The requested value or 0, if the requested address was not found within the buffer.
function TNoDave.GetFloat(Address: Integer; Buffer: Pointer; BufOffs: Integer; BufLen: Integer): Double;
var
BufPtr: Pointer;
begin
BufPtr:=BufferAt(Address, 4, Buffer, BufOffs, BufLen);
If Assigned(BufPtr) then Result:=daveGetFloatFrom(BufPtr) else Result:=0;
end;
//Return the Window-Handle (HWND) used for system-calls.
//~result The Window-Handle (HWND).
function TNoDave.GetHandle: THandle;
var
Parent: TComponent;
begin
Parent:=Self;
while Assigned(Parent.Owner) and not (Parent is TWinControl) do Parent:=Parent.Owner;
if Parent is TWinControl then Result:=TWinControl(Parent).Handle else
begin
If FHandle = 0 then FHandle:=AllocateHwnd(Nil);
Result:=FHandle;
end;
end;
//Return the SmallInt-value read last from the PLC at the specified address.
//~param Address Address of the requested value
//~param Buffer Pointer to the buffer holding the PLC-data. The internal buffer is used, if Nil (default).
//~param BufOffs Offset-address of the buffer within the address-range of the PLC.
//~param BufLen Length of the buffer in bytes.
//~result The requested value or 0, if the requested address was not found within the buffer.
function TNoDave.GetInt(Address: Integer; Buffer: Pointer; BufOffs: Integer; BufLen: Integer): SmallInt;
var
BufPtr: Pointer;
begin
BufPtr:=BufferAt(Address, 2, Buffer, BufOffs, BufLen);
If Assigned(BufPtr) then Result:=daveGetS16From(BufPtr) else Result:=0;
end;
//Return the Word-value read last from the PLC at the specified address.
//~param Address Address of the requested value
//~param Buffer Pointer to the buffer holding the PLC-data. The internal buffer is used, if Nil (default).
//~param BufOffs Offset-address of the buffer within the address-range of the PLC.
//~param BufLen Length of the buffer in bytes.
//~result The requested value or 0, if the requested address was not found within the buffer.
function TNoDave.GetWord(Address: Integer; Buffer: Pointer; BufOffs: Integer; BufLen: Integer): Word;
var
BufPtr: Pointer;
begin
BufPtr:=BufferAt(Address, 2, Buffer, BufOffs, BufLen);
If Assigned(BufPtr) then Result:=daveGetU16From(BufPtr) else Result:=0;
end;
//Return the description of the return-code in ~[link .LastError LastError].
//~result The description of the return-code.
function TNoDave.GetLastErrMsg: String;
begin
If FLastError = 0 then Result:='' else Result:=GetErrorMsg(FLastError);
end;
//Scan the MPI-bus for all reachable partners
//~result List with True for available partners and False for unavailable partners.
function TNoDave.ListReachablePartners: TNoDaveReachablePartnersMPI;
type
TByteList = Array [0..126] of Byte;
PByteList = ^TByteList;
var
List: Pointer;
WasActive: Boolean;
Index: Integer;
begin
GetMem(List, SizeOf(TByteList));
try
WasActive:=Active;
Active:=True;
If Active then
begin
daveListReachablePartners(DaveIntf, List);
Index:=0;
While Index < 127 do
begin
Result[Index]:=(PByteList(List)^[Index] = daveMPIReachable);
Inc(Index);
end;
end else begin
Index:=0;
While Index < 127 do
begin
Result[Index]:=False;
Inc(Index);
end;
end;
Active:=WasActive;
finally
FreeMem(List);
end;
end;
//Open the connection to the PLC after the instance is completely loaded from the stream and if Active is True.
procedure TNoDave.Loaded;
begin
inherited;
If FActive then
begin
FActive:=False;
Connect;
end;
end;
//Lock the communication-routines for the current tread.
procedure TNoDave.Lock;
begin
LockNoDave.Enter;
end;
//Determine the libnodave.dll-code of a protocol
//~param Prot The requested protocol
//~result The libnodave.dll code for the protocol
function TNoDave.ProtCode(Prot: TNoDaveProtocol): Integer;
begin
Result:=-1;
Case Prot of
daveProtoMPI: Result:=0;
daveProtoMPI2: Result:=1;
daveProtoMPI3: Result:=2;
daveProtoMPI4: Result:=3;
daveProtoPPI: Result:=10;
daveProtoAS511: Result:=20;
daveProtoS7Online: Result:=50;
daveProtoISOTCP: Result:=122;
daveProtoISOTCP243: Result:=123;
daveProtoIBH: Result:=223;
daveProtoIBH_PPI: Result:=224;
daveProtoNLPro: Result:=230;
end;
end;
//Read the Data specified by the properties ~[link .Area Area], ~[link .DBNumber DBNumber], ~[link .BufOffs BufOffs]
//and ~[link .BufLen BufLen] from the PLC into the buffer.
//~param Buffer Pointer to the buffer for PLC-data. The internal buffer is used, if Nil (default).
procedure TNoDave.ReadBytes(Buffer: Pointer);
begin
If not Assigned(Buffer) then Buffer:=FBuffer;
If Active then
begin
DoReadBytes(FArea, FDBNumber, FBufOffs, FBufLen, Buffer);
DoOnRead;
end;
end;
//Read the specified Data from the PLC into the buffer.
//~param Area Requested PLC-area.
//~param DB Number of requested datablock. Only used, if reading from Datablocks in the PLC.
//~param Start Start-address of the requested data within the address-range of the PLC.
//~param Size Length of the requested PLC-data in bytes.
//~param Buffer Pointer to the buffer for PLC-data. The internal buffer is used, if Nil (default).
procedure TNoDave.ReadBytes(Area: TNoDaveArea; DB, Start, Size: Integer; Buffer: Pointer);
begin
If not Assigned(Buffer) then
begin
FArea:=Area;
FDBNumber:=DB;
FBufOffs:=Start;
FBufLen:=Size;
ReadBytes(Buffer);
end else begin
DoReadBytes(Area, DB, Start, Size, Buffer);
end;
end;
//Set the property ~[link .Active Active] and call either ~[link .Connect Connect] or ~[link .Disconnect Disconnect].
//depending on the requested value.
//~param V The requested state.
procedure TNoDave.SetActive(V: Boolean);
begin
If V then Connect else Disconnect;
end;
//Set the property ~[link .Area Area].
//~param V The ~[link TNoDaveArea PLC-Area].
procedure TNoDave.SetArea(V: TNoDaveArea);
begin
FArea:=V;
If V in [daveDB, daveDI, daveLocal] then
begin
If FDBNumber = 0 then FDBNumber:=1;
end else FDBNumber:=0;
If Active and (csDesigning in ComponentState) then ReadBytes;
end;
//Set the property ~[link .BufLen BufLen] and reserve the required memory.
//~param V The length of the buffer in bytes.
procedure TNoDave.SetBufLen(V: Integer);
begin
If Assigned(FBuffer) then
try
FreeMem(FBuffer);
except
end;
FBufLen:=V;
GetMem(FBuffer, FBufLen);
If Active and (csDesigning in ComponentState) then ReadBytes;
end;
//Set the property ~[link .BufOffs BufOffs].
//~param V The address within the address-range of the PLC.
procedure TNoDave.SetBufOffs(V: Integer);
begin
FBufOffs:=V;
If Active and (csDesigning in ComponentState) then ReadBytes;
end;
//Set the property ~[link .ComPort ComPort].
//~param V The Name of the ComPort.
procedure TNoDave.SetComPort(V: String);
begin
If FProtocol in [daveProtoMPI, daveProtoMPI2, daveProtoMPI3, daveProtoMPI4, daveProtoPPI, daveProtoAS511] then Disconnect;
FComPort:=V;
end;
//Set the property ~[link .ComSpeed ComComSpeed].
//~param V The Name of the ComPort.
procedure TNoDave.SetComSpeed(V: TNoDaveComSpeed);
begin
If FProtocol in [daveProtoMPI, daveProtoMPI2, daveProtoMPI3, daveProtoMPI4, daveProtoPPI, daveProtoAS511] then Disconnect;
FComSpeed:=V;
end;
//Set the property ~[link .CpuRack CpuRack].
//~param V The rack of the PLC containing the CPU.
procedure TNoDave.SetCpuRack(V: Integer);
begin
Disconnect;
FCpuRack:=V;
end;
//Set the property ~[link .CpuSlot CpuSlot].
//~param V The Slot of the PLC containing the CPU.
procedure TNoDave.SetCpuSlot(V: Integer);
begin
Disconnect;
FCpuSlot:=V;
end;
//Set the property ~[link .DBNumber DBNumber].
//~param V The requested number of the datablock.
procedure TNoDave.SetDBNumber(V: Integer);
begin
FDBNumber:=V;
If Active and (csDesigning in ComponentState) then ReadBytes;
end;
//Set the property ~[link .Interval Interval].
//~param V The Interval for the background-communication in milliseconds. 0 if no background-communication is desired.
procedure TNoDave.SetInterval(V: Cardinal);
begin
FInterval:=V;
If Active then
begin
If (FInterval > 0) then
begin
If not Assigned(ReadThread) and not (csDesigning in ComponentState) then ReadThread:=TNoDaveReadThread.Create(Self);
end else begin
If Assigned(ReadThread) then
begin
ReadThread.WaitFor;
FreeAndNil(ReadThread);
end;
end;
end;
end;
//Set the property ~[link .IntfName IntfName].
//~param V The symbolic name of the interface.
procedure TNoDave.SetIntfName(V: String);
begin
Disconnect;
FIntfName:=V;
end;
//Set the property ~[link .IntfTimeout IntfTimeout].
//~param V The timeout of the interface in milliseconds.
procedure TNoDave.SetIntfTimeout(V: Integer);
begin
FIntfTimeout:=V;
If Active then DaveIntf^.timeout:=FIntfTimeout;
end;
//Set the property ~[link .IPAddress IPAddress].
//~param V The IP-address or name of the TCP/IP partner station.
procedure TNoDave.SetIPAddress(V: String);
begin
If FProtocol in [daveProtoISOTCP, daveProtoISOTCP243, daveProtoIBH, daveProtoIBH_PPI, daveProtoNLPro] then Disconnect;
FIPAddress:=V;
end;
//Set the property ~[link .IPPort IPPort].
//~param V The IP-Port of the TCP/IP parter station.
procedure TNoDave.SetIPPort(V: Integer);
begin
If FProtocol in [daveProtoISOTCP, daveProtoISOTCP243, daveProtoIBH, daveProtoIBH_PPI, daveProtoNLPro] then Disconnect;
FIPPort:=V;
end;
//Set the property ~[link .MPILocal MPILocal].
//~param V The local MPI-address for the MPI communication.
procedure TNoDave.SetMPILocal(V: Integer);
begin
If FProtocol in [daveProtoMPI, daveProtoMPI2, daveProtoMPI3, daveProtoMPI4, daveProtoPPI, daveProtoIBH, daveProtoIBH_PPI, daveProtoNLPro] then Disconnect;
FMPILocal:=V;
end;
//Set the property ~[link .MPIRemote MPIRemote].
//~param V The remote MPI-address for the MPI communication.
procedure TNoDave.SetMPIRemote(V: Integer);
begin
If FProtocol in [daveProtoMPI, daveProtoMPI2, daveProtoMPI3, daveProtoMPI4, daveProtoPPI, daveProtoIBH, daveProtoIBH_PPI, daveProtoNLPro] then Disconnect;
FMPIRemote:=V;
end;
//Set the property ~[link .MPISpeed MPISpeed].
//~param V The ~[link TNoDaveSpeed speed] of the MPI-bus.
procedure TNoDave.SetMPISpeed(V: TNoDaveSpeed);
begin
If FProtocol in [daveProtoMPI, daveProtoMPI2, daveProtoMPI3, daveProtoMPI4, daveProtoPPI, daveProtoIBH, daveProtoIBH_PPI, daveProtoNLPro] then Disconnect;
FMPISpeed:=V;
end;
//Set the property ~[link .Protocol Protocol].
//~param V The requested ~[link TNoDaveProtocol Protocol].
procedure TNoDave.SetProtocol(V: TNoDaveProtocol);
begin
Disconnect;
FProtocol:=V;
If FProtocol in [daveProtoIBH, daveProtoIBH_PPI] then FIPPort:=1099;
If FProtocol in [daveProtoNLPro] then FIPPort:=7777;
If FProtocol in [daveProtoISOTCP, daveProtoISOTCP243] then FIPPort:=102;
end;
//Swap the byte-order in a 16-bit value.
//~param Value The value for the conversion.
//~result The converted value.
function TNoDave.Swap16(Value: SmallInt): SmallInt;
begin
Result:=daveSwapIed_16(Value);
end;
//Swap the byte-order in a 32-bit value.
//~param Value The value for the conversion.
//~result The converted value.
function TNoDave.Swap32(Value: Integer): Integer;
begin
Result:=daveSwapIed_32(Value);
end;
//Unlock the communication-routines for other threads.
procedure TNoDave.Unlock;
begin
LockNoDave.Leave;
end;
//Write a Bit-value into the PLC at the specified address without changing the properties of the TNoDave-instance.
//~param Area Requested PLC-area.
//~param DB Number of requested datablock. Only used, if writing into datablocks of the PLC.
//~param Address Byte-address of the value
//~param Bit Bit-address of the value
//~param Value Value to write into the PLC.
procedure TNoDave.WriteBit(Area: TNoDaveArea; DB, Address, Bit: Integer; Value: Boolean);
var
Output: LongInt;
begin
try
LockNoDave.Enter;
If Value then Output:=1 else Output:=0;
FLastError:=daveWriteBits(DaveConn, AreaCode(Area), DB, (Address*8)+Bit, 1, @Output);
except
On E: Exception do DoOnError('Error in function TNoDave.WriteBit: ' + E.Message);
end;
LockNoDave.Leave;
end;
//Write the buffer into the PLC at the address specified by the properties ~[link .Area Area], ~[link .DBNumber DBNumber],
//~[link .BufOffs BufOffs] and ~[link .BufLen BufLen].
//~param Buffer Pointer to the buffer for PLC-data. The internal buffer is used, if Nil (default).
procedure TNoDave.WriteBytes(Buffer: Pointer);
begin
If not Assigned(Buffer) then Buffer:=FBuffer;
If Active then
begin
DoWriteBytes(FArea, FDBNumber, FBufOffs, FBufLen, Buffer);
DoOnWrite;
end;
end;
//Write the buffer into the PLC at the specified address after setting up the properties with the given values.
//~param Area Requested PLC-area. Changes the property ~[link .Area Area].
//~param DB Number of requested datablock. Changes the property ~[link .DBNumber DBNumber]. Only used, if writing into datablocks of the PLC.
//~param Start Start-address of the buffer within the address-range of the PLC. Changes the property ~[link BufOffs].
//~param Size Length of the buffer in bytes. Changes the property ~[link .BufLen BufLen].
//~param Buffer Pointer to the buffer for PLC-data. The internal buffer is used, if Nil (default).
procedure TNoDa
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