Posted 30 May 2017 Hello, I have to communicate Trane chiller to CJ2M-CPU34 with CJ1W-SCU31-V1 module via Modbus RTU RS-485. Do you know the best way to do this? Any advices? I attach Modbus registry from slave device. Share this post Link to post Share on other sites
Posted 31 May 2017 Functions blocks and manuals here for comms. https://www.support-omron.fr/Programmes.php#BF Share this post Link to post Share on other sites
Posted 31 May 2017 I know this source, but in library for master scu communication I found function block for 3,5,6,10 Modbus function. In my application, I have to use Modbus function 2 and 4. Share this post Link to post Share on other sites
Posted 31 May 2017 (edited) This one has 2 & 4. http://forums.mrplc.com/index.php?/files/file/867-easy-to-use-modbus-rtu-master-for-cp1l-cp1h-cj1-cj2-cs1/ Looking through the download section here for Omron you will find lots of solutions. Edited 31 May 2017 by BobB Share this post Link to post Share on other sites
Posted 6 Jun 2017 I decided to use this solution. In my simulation I have CP1L-EM PLC and option board CP1W-CIF11. I bought usb-rs485 converter:http://cel-mar.pl/en/usb_rs485_rs422_i9140.htmI use slave simulator from modbustools site: http://www.modbustools.com/download.htmlI want to read an actual value from 40001 registry (which is configured in modbus slave simulator). Unfortunately, I can read any value. Please help.In attachment you can find a program from CX-Programmer and settings from modbustools slave simulator. PLC_CIF_11_COMM_2.cxp Share this post Link to post Share on other sites
