Posted 21 Dec 2020 Hi all, I have a Wago PLC and sometimes all IO's start flashing on and off. Then I need to be near the PLC and check the error LED's. They are blinking in a certain way with pauses which gives the error and sub-error code. It seemed there was an error with K-bus. An IO module was missing. I removed some IO's and replaced them again and restarted the PLC a couple times with the end module somewhere in between and suddenly the error was gone. All IO modules were in the same place again and everything worked again. I suppose there is a bad contact somewhere? Maybe I need extra power modules? It happens only once every month or so... 1st question: anyone has an idea of what the reason for this fault could be? 2nd question: is there any place where I can see a log of these errors? I can't find it anywhere in codesys or in the web interface. I'm looking for something like "diagnostic buffer" in Siemens PLC's. Thanks! Share this post Link to post Share on other sites