muc82 Posted April 17, 2019 Report Share Posted April 17, 2019 Hi, I have an problem, which never occoured before. I am using PLC M91-2-T2C for simple operation (inpusts are controlling the outputs). During operation PLC stops, on the display it is writen Program Stop. This now already happened twice. PLC was working fine till now over last two years. Any ideas? Quote Link to comment Share on other sites More sharing options...
DanT Posted April 17, 2019 Report Share Posted April 17, 2019 (edited) Hi ; A few things to check : Electrical Noise can be an issue. Are the PNP outputs controlling relays ---- are there suppressors on the relay coils? Are the relays controlling other relays or solenoids? Do they have suppressors? Check the relay contacts visually- smoky or pitted? do they arc when switching? -- replace the relays and add suppression to reduce the kickback. ( locate the article about Electrical noise suppression -- and see pinned top of this section -- Flyback Diode -- Great advice ) Check your power supply. Also -- upload the program into U90 Ladder and compare it to the original - ( Memory Glitch) -- Check the battery -- via info Mode -- SB9 1 = Low Battery DanT Edited April 17, 2019 by DanT Added more information Quote Link to comment Share on other sites More sharing options...
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