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Old June 30th, 2020, 12:26 PM   #1
United States

bigLee is offline
Join Date: Jun 2018
Location: Florida
Posts: 37
1756 L81 v.30.00 ESM module fault disappeared


I had an out of box controller 1756 L81 Contrologix. Was running for about a week and started getting the ESM fault. Powercycling did nothing. I downloaded the program again to flash and the ESM error went away. Maybe 2 days later it reappeared. Downloading to the controller would clear it temporarily.

This particular unit doesn't have a removable module. You have to replace the whole controller.

I have since put a blank program in the controller and left powered on for 2 weeks. The ESM fault has not occurred again.

Has anyone else experienced this? Is the battery good or should I just get a new controller?
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Old June 30th, 2020, 05:37 PM   #2
James Mcquade
United States

James Mcquade is offline
Join Date: Oct 2007
Location: Tennessee
Posts: 2,777
if you bought the unit from an ab rep, call them up and explain the issue. they should take the unit back as defective since the unit is not that old. we have done this 1 or 2 times.
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Old June 30th, 2020, 09:01 PM   #3
United States

VAN is offline
Join Date: Apr 2012
Location: Wa
Posts: 331
Is the PLC in a temperature controlled environment?

I've had issues with the new series and faulting after being stored in a cold environment, when PLC came back to an OK temperature the fault cleared after a couple of power cycles.
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Old July 1st, 2020, 03:58 AM   #4

tarik1978 is offline
Join Date: Mar 2010
Location: casablanca
Posts: 564
check this technote from AB
ESM fault scrolling across the 1756 controller display
“A bird sitting on a tree is never afraid of the branch breaking, because her trust is not on the branch but on it’s own wings. Always believe in yourself”
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