1756 HSC issues with Z gate pulse

pauly

Member
Join Date
May 2002
Location
South Wales,U.k
Posts
244
:unsure:I am trying to use a 1756 HSC in a Logix rack in mode 4 (store reset, start) using a PEC into the Z input. My problem is that I have two seperate PEC signals from two unwind reels being switched via isolated outputs to the Z input on the counter card, when the reel I want to monitor is running on it's own things are fine but when the other reel is moved then the other PEC seems to trigger the counter! This even though there is no physical connection to the counter apart from via the two isolated relays on the output card.
Any thoughts or help would be very much appreciated.
 

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