Rockwell Automation Publication 440R-UM013F-EN-P - July 2021 63
Chapter 11 Troubleshooting
Channel Simultaneity (Discrepancy)
GSR safety 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 (see
Figure 68
).
Figure 68 - GSR Safety Relays Have Infinite Simultaneity (Discrepancy)
Multiple-channel Cycling
GSR safety relay inputs are not satisfied if one channel turns ON and OFF
multiple times, followed by the closure of the second channel (see 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
Table 16 - Wire Resistance
ISO Cross Section
[mm²]
AWG Ω Per 1000 m Ω Per 1000 ft
0.33 22 52.94 16.14
0.5 20 33.30 10.15
0.75 18 20.95 6.386
1.5 16 13.18 4.016
2.5 14 8.28 2.525
4125.211.588
Channel 1
Channel 2
Open
Closed
Open
Closed
Time
Time
Channel 1
Channel 2
Open
Closed
Open
Closed
Time
Time
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