We buy and sell used industrial machinery. We have a machine with a Mitsubishi FX2N 32MR-ES/UL PLC. The battery light was on when we first powered it up and sure enough, the program was lost. We sent the PLC back to the manufacturer to be reprogrammed. When it was returned, I got an upload (as we try to do with every (PLC) machine that arrives).
However, when we reinstalled it, there was no communication with the HMI. We've tested the HMI on another machine and it works fine. We've examined and "belled out" the cable and all seems fine there. So I would estimate it's 90%+ that the PLC is defective or its settings are wrong.
Speaking with the machine manufacturer, they said that:
"The internal memory of the PLC needs to be cleared before updating the program and I do it with all PLC software uploads [I think he means downloads]. I had another similar incident a few years back where the PLC needed to be reprogramed for similar issues."
Is this a thing with FX2Ns? I see the Clear PLC Memory button in the Write to PLC dialog in GX Developer. I assume that's what I need to click before I download the program that I uploaded? What's the likelihood that the upload is defective do you think? I'm going to try it anyway - the machine manufacturer has offered to reprogram it again for free anyway. Just trying to save some time and carriage costs.
However, when we reinstalled it, there was no communication with the HMI. We've tested the HMI on another machine and it works fine. We've examined and "belled out" the cable and all seems fine there. So I would estimate it's 90%+ that the PLC is defective or its settings are wrong.
Speaking with the machine manufacturer, they said that:
"The internal memory of the PLC needs to be cleared before updating the program and I do it with all PLC software uploads [I think he means downloads]. I had another similar incident a few years back where the PLC needed to be reprogramed for similar issues."
Is this a thing with FX2Ns? I see the Clear PLC Memory button in the Write to PLC dialog in GX Developer. I assume that's what I need to click before I download the program that I uploaded? What's the likelihood that the upload is defective do you think? I'm going to try it anyway - the machine manufacturer has offered to reprogram it again for free anyway. Just trying to save some time and carriage costs.