Modbus TCP with Saia PCD3

Discussion about communication protocols (configuration, functions, hardware required).
manutenzioneinfra
Posts: 14
Joined: Tue May 17, 2011 11:02 am

Modbus TCP with Saia PCD3

Postby manutenzioneinfra » Tue Feb 07, 2017 8:40 am

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

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admin
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Re: Modbus TCP with Saia PCD3

Postby admin » Tue Feb 07, 2017 8:53 am

Hi,
which Winlog version are you using? In gate configuration you have set "Enable Writing to device"?

Best regards

manutenzioneinfra
Posts: 14
Joined: Tue May 17, 2011 11:02 am

Re: Modbus TCP with Saia PCD3

Postby manutenzioneinfra » Tue Feb 07, 2017 4:55 pm

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.

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admin
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Re: Modbus TCP with Saia PCD3

Postby admin » Wed Feb 08, 2017 9:17 am

Hi,
I think that the PLC does not respond correctly to coil writing. Numeric gate are writing correctly?

manutenzioneinfra
Posts: 14
Joined: Tue May 17, 2011 11:02 am

Re: Modbus TCP with Saia PCD3

Postby manutenzioneinfra » Wed Feb 08, 2017 11:34 am

Hi, yes numeric gates are correctly written.


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