Posted 27 Dec 2011 (edited) Hello everyone... The problem we are facing is that our Mitsubishi qseries cpu 06H goes on error. We tried to communicate it with gx developer but it doesn't response, as we have already the backup of our program so we also try to erase or clear the PLC memory but every time we get the same communication error. We also try to reset and Lclr with the switch and hold it for 10 secs but nothing happen. Battery is ok, the stop and run switch is not responding, only the Error RED LED is ON. What is the solution to get the cpu back to run? Thanks in advance... Edited 27 Dec 2011 by Roomi Share this post Link to post Share on other sites
Posted 27 Dec 2011 Sounds to me like a WDT error. But you should be able to communicate with the PLC. If you have a backup of the project I would disconnect the battery and the power and wait for the until the program is cleared. Share this post Link to post Share on other sites
Posted 27 Dec 2011 When you try to communicate via GX Developer, do you connect directly to the PLC (Serial or USB), or via Ethernet? You should connect directly via serial/USB Share this post Link to post Share on other sites
Posted 4 Jan 2012 Sounds like a dead CPU. There are no settings which can prevent the serial port or the run/stop switch from working. Share this post Link to post Share on other sites