Posted 26 Mar 2022 Hello friends I have worked with other series of omron plc but this is the first time I am working with cqm1h cpu51 series. In a factory, 4 of these PLCs exchange data with each other with a clk21 card. After a problem with one of the CPUs and replacement, I was never able to download the datalink settings. I did all the steps in the manuals step by step but I did not succeed. In cx-net software, after selecting online, I selected the data link menu, but as you can see in the attached image, the setup button is never activated. Thanks for guiding me Share this post Link to post Share on other sites