Created Date: November 14,2011

Created by: Do-more PE

Not really. You have a power or noise issue of some sort. Power and noise are about the only things that will drop a PLC out of run mode.

It could be that you have unsuppressed coils somewhere on the power line causing spikes in the power, it could be that there is a large motor somewhere else that is turning on and off and causing the issue, you could have a bad ground that is letting noise into the PLC, or it might be that you have a floating neutral.

One other possibility is that there is noise coming into the PLC through a communications line that might be hooked to an HMI or some other device.

There are many other reasons, but these are usually the top suspects.

Created Date: November 14,2011

Created by: tmwtbd

Thank you,

There is nothing connected to com ports on this. It is however running a dielectric tester @ 18,000 volts. I have serval of these in service but this is only issue. I will check power and possibly install a powerline filter.

Thanks,

Bob

Created Date: November 14,2011

Created by: tmwtbd

Hello,

I have a small machine with DL205 system. It has a DL240 CPU, 2 input cards and 2 output cards. No analog.

Several times over last month the machine stops and I notice CPU run light not lit. Cycling power solves the problem. After first couple times I did install a new CPU hoping that would alleviate the problem but it hasn't.

I have went online prior to cycling power and don't see any alarms. I am also able to switch back to run mode via DirecSoft 5.

Any way to catch this issue with programming???

Thanks,

Bob