plcc

[hawkeye23]

there recently has been a couple of problems where there has been a loss of a plc card or two.
1.should plc have tvss install @ the 120v feed for the slc 500 ?

2. what about the use of veresistors on the field devices like actuators that use solenoids to send air into valve to open up and then send a feed back signal to plc ?


I do not have any plc knowledge just some ideas that i am not sure of. If there is something to add that might help please let me know.

 

[S'mise]

More than likely the problem is at the load and not the line. Yes, Varistors or diodes at the devices help with inductive loads.
How about more info; what type of card is burning out? what load connected? Ratings ok? It could be a number of things besides the card.