Rockwell Automation Publication 440R-UM013E-EN-P - March 2017 73
Troubleshooting Chapter 11
Channel Simultaneity (Discrepancy)
GSR relays have infinite simultaneity (sometimes referred to as discrepancy).
One channel can close (at T1) and the other channel can close much later (at
T2), and the input circuit is satisfied. The order in which the channels close is
not significant; either channel can close before the other (Figure 68
).
Figure 68 - GSR Relays Have Infinite Simultaneity (Discrepancy)
Multiple-channel Cycling
GSR relay inputs are not satisfied if one channel turns ON and OFF multiple
times, followed by the closure of the second channel (Figure 69
). The input
status indicator remains red. This condition is not shown as a fault condition
by the PWR/Fault status indicator. To clear this condition, open both channels
and then reclose them.
Figure 69 - Multiple Cycles on One Channel Are Not Allowed
Open
Channel 1
Channel 2
Closed
Open
T1 T2
Closed
Time
T1 T2
Time
Open
Channel 1
Channel 2
Closed
Open
T1 T2
Closed
Time
T1 T2
Time
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