Ginger_Sai Posted October 19 Report Share Posted October 19 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). Quote Link to comment Share on other sites More sharing options...
MVP 2022 Joe Tauser Posted October 20 MVP 2022 Report Share Posted October 20 If you could post links to the modules you're using and upload your PLC program we could be more helpful. Joe T. Quote Link to comment Share on other sites More sharing options...
Ginger_Sai Posted October 20 Author Report Share Posted October 20 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 Quote Link to comment Share on other sites More sharing options...
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