Posted 26 May 2021 I have a PLC 5 program that is acting as a master controller for several other various PLCs. I have found where an input is coming in off of ControlNet. I went to the relevant ControlLogix program but I cannot find where this output is being written to. I am fairly new to Rockwell as I have come from a Melsec background. Any help would be appreciated. Share this post Link to post Share on other sites
Posted 27 May 2021 There has to be a message block in one of the two processors. Either the PLC-5 is reading, or the CLX is writing. Since when the PLC-5 was in it's prime, CLX's did not exist, it is easier to configure a write to a PLC-5. In the CLX program, open the controller tags, there is a column for data type, double click on it and it will sort by data type, then look for a MSG. Then, if you find a MSG, highlight the row, then right click and select cross reference to find where it's located in the logic. 1 person likes this Share this post Link to post Share on other sites