Brijm
Lifetime Supporting Member
I have a customer with a SLC 5/04 that is losing memory on Power down. We have changed the battery, power supply, cpu, rack, and the I/O modules.
It does seem like when we power down, about every other time, we will have a solid fault LED, and must power down again, before I can communicate with the PLC to download.
I remembered seeing about the grounding causing memory loss here, so I have him checking that (I don't believe there was a ground to the chassis). I've never seen about the hard fault however (solid LED).
I suspect the ground may take care of it (we've changed everything else); but, wanted to see if this sounded familiar to anyone. All I could find in the AB knowledgebase pointed to the power supply, and CPU/
Thanks,
It does seem like when we power down, about every other time, we will have a solid fault LED, and must power down again, before I can communicate with the PLC to download.
I remembered seeing about the grounding causing memory loss here, so I have him checking that (I don't believe there was a ground to the chassis). I've never seen about the hard fault however (solid LED).
I suspect the ground may take care of it (we've changed everything else); but, wanted to see if this sounded familiar to anyone. All I could find in the AB knowledgebase pointed to the power supply, and CPU/
Thanks,