PascalScada can not work on Arduino. This is no target.
FreePascal is basic on Arduino. No LCL, no gui. Better is to use native Arduino Tools to implement a protocol. Except you are a excellent coder.
Normal you use PascalScada to communikate from a PC to some PLCs to show dataon the PC and Send some simple Commands to the PLC. Man Machine Interface (MMI or HMI) is the correct word for it. Not IPC, InterProcessCommunication is NOT the target of PascalScada.
I think you want to ride the wrong horse, if i look on your posts.