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Modbus TCP with Saia PCD3

Posted: Tue Feb 07, 2017 8:40 am
by manutenzioneinfra
Hi i use this kind of communication to read/write register and "only read" coil with my plc Saia PCD3 configured as server in modbus tcp. I wrote "only read" because if i try to write a coil i have this kind of issue..the communication on winlog goes in error, not into the plc, and the strange thing is that the coil is written. Do you have some idea to solve the problem?

Thanks

Re: Modbus TCP with Saia PCD3

Posted: Tue Feb 07, 2017 8:53 am
by admin
Hi,
which Winlog version are you using? In gate configuration you have set "Enable Writing to device"?

Best regards

Re: Modbus TCP with Saia PCD3

Posted: Tue Feb 07, 2017 4:55 pm
by manutenzioneinfra
Hi,
winlog Version 2.07.30, writing to device enabled.example Writing command 1:
I have used this kind of protocol with telemecanique plc without problems, the strange thing is that the protocol fall down after the correct writing command of the coil variable.

Re: Modbus TCP with Saia PCD3

Posted: Wed Feb 08, 2017 9:17 am
by admin
Hi,
I think that the PLC does not respond correctly to coil writing. Numeric gate are writing correctly?

Re: Modbus TCP with Saia PCD3

Posted: Wed Feb 08, 2017 11:34 am
by manutenzioneinfra
Hi, yes numeric gates are correctly written.