Ginger_Sai Posted October 19, 2023 Report Share Posted October 19, 2023 Good afternoon, my automated control system uses a Unitronics V1040-T20B PLC and expansion modules from another company (Reallab NLS series). The PLC has the ability to communicate via ModBus RTU with devices that support ModBus RTU communication. In order for there to be a connection between them, I use function 2 (Read input) and function 5 (Force coil), as it was said in the video tutorial on the Unitronics channel. But I have a problem that the PLC does not read all the states and does not set all the values in the input and output modules respectively, but processes only about 45-50 signals. What could be the problem? ModBus RTU data exchange protocol (installed on the PLC and on all expansion modules); Data transfer rate 115200 (installed on the PLC and on all expansion modules); Parameters of the COM port 8-N-1 (installed on the PLC and on all expansion modules). Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted October 20, 2023 MVP 2023 Report Share Posted October 20, 2023 If you could post links to the modules you're using and upload your PLC program we could be more helpful. Joe T. Link to comment Share on other sites More sharing options...
Ginger_Sai Posted October 20, 2023 Author Report Share Posted October 20, 2023 2 hours ago, Joe Tauser said: If you could post links to the modules you're using and upload your PLC program we could be more helpful. Joe T. I attach the working program and the manual to the extension modules new project.vlp NLS-16DO-16DI-8R.pdf Link to comment Share on other sites More sharing options...
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