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Old March 13th, 2019, 09:49 AM   #7
James Mcquade
United States

James Mcquade is offline
Join Date: Oct 2007
Location: Tennessee
Posts: 2,840
it could be one of the following.
bad power to the plc supply, is a surge suppressor installed?
power supply going bad
cpu going bad
an I//o card going bad
water/ moisture in the system

may I suggest that the next time they have the fault and power down the system.

disconnect all plc components and reconnect them several times, you may have a dirty contact at a connection block. we have had this to occur here several times.

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