View Full Version : ML1400 error 50H !

September 9th, 2013, 11:46 AM
Hello everyone,

I have a dump question,

one of my customer power on and off PLC, everything is ok till oneday they power on and off PLC again and .... fault happen, error code 50H, I got online and ... most of the code has been wiped out, only main rung is there. other rungs are all disappear!

What was wrong ???


September 9th, 2013, 12:43 PM
See picture.

Does the controller have a memory module with an up-to-date program?

Check grounding and make sure all inductive loads have surge protection.

September 9th, 2013, 01:44 PM
it is ML1400 with up-to-date coding in there.
I checked the error code and look at configuration, it wiped out the configuration also (no expansion recognized)and wiped out the code.
I just reload the code.
But just wondering what is the cause.
I'm not the control builder, but I think they all have grounding and surge protection !

September 9th, 2013, 04:18 PM
When you're out of idea, check your grounds and after a while, you'll be qualified to be hired by Rockwell group!!!

Your best bet is probably a memory module to backup the loaded application and use it if this happend again.