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Old October 25th, 2017, 07:43 PM   #1
PPRE&I
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1771 OAD B No Active light

Have three 1771 OAD B output cards that the active light does not come on.
Stand alone rack..no remote racks
Tried new cards...same
Tried new power supply...same
Tried new backplane with original ps...same
Changing powers supply with new backplane...waiting to hear results

Any thought about possible issues? Reading manual points to loss of 5V from power supply???

TIA
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Old October 25th, 2017, 09:07 PM   #2
James Mcquade
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does the plc have a program in it and is it in run mode or remote run mode?

regards,
james
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Old October 25th, 2017, 09:12 PM   #3
PPRE&I
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Yes original processor with original program. Have tried different processor and downloads program. Both times in run mode. Cycled program to run after downloading.
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Old October 26th, 2017, 12:08 AM   #4
Mickey
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See pdf, but not sure it's going to help.
Attached Files
File Type: pdf troubleshooting.pdf (30.6 KB, 9 views)
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Old October 26th, 2017, 08:27 AM   #5
PPRE&I
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Yes somewhat helpful..thanks so much.
Problem solved, was a flaky analog input card that was the culprit.
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Old October 26th, 2017, 11:05 AM   #6
Mickey
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Quote:
Originally Posted by PPRE&I View Post
Yes somewhat helpful..thanks so much.
Problem solved, was a flaky analog input card that was the culprit.
Thanks for sharing your solution.
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