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Author Topic: OPC client with Lazarus  (Read 49480 times)

denny.chou

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Re: OPC client with Lazarus
« Reply #60 on: November 24, 2021, 04:17:58 am »
Quote from: avra on November 23, 2021, 10:26:18 pm

Normally not, but there are OPC-UA to OPC-DA gateways which allow that.

For direct OPC-DA access you can use something like this: https://github.com/seryal/OPCComponent

Thank you for your valuable response
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denny.chou

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Re: OPC client with Lazarus
« Reply #61 on: November 24, 2021, 06:57:33 am »
"For direct OPC-DA access you can use something like this: https://github.com/seryal/OPCComponent"

What should I do if such an error message appears when installing this component? thanks！

OPCtypes.pas(37,69) Error: Data element too large
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avra

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Re: OPC client with Lazarus
« Reply #62 on: November 24, 2021, 09:14:46 am »
Quote from: denny.chou on November 24, 2021, 06:57:33 am
What should I do if such an error message appears when installing this component?
Contact author or open a github issue? I haven't used that coponent for a while, so maybe trying older Lazarus like 2.0.x might be worth trying.
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ct2laz - Conversion between Lazarus and CodeTyphon
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pasettimino - Siemens S7 PLC lib

denny.chou

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Re: OPC client with Lazarus
« Reply #63 on: November 26, 2021, 04:18:40 am »
Quote from: avra on November 24, 2021, 09:14:46 am
Contact author or open a github issue? I haven't used that coponent for a while, so maybe trying older Lazarus like 2.0.x might be worth trying.

Thank you very much for your suggestion. The author has assisted with this issue.
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