64 Rockwell Automation Publication 440R-UM013G-EN-P - December 2022
Chapter 11 Troubleshooting
Recovery Time
Recovery time is a delay time that is required, measured from when the safety relay inputs
turned off until they can turn back on again. GSR safety relays have a 30 ms recovery time
specification (see Figure 72).
The GSR family of safety relays has conservative recovery time specifications. Actual
measurements show the recovery time to be as fast as 20 ms. As a result, recovery time is
unlikely to cause spurious trips.
Figure 72 - Recovery Time
Fast input cycling, where both input channels are cycled simultaneously, has three outcomes:
• Cycles shorter than 7 ms are ignored.
• Cycles of 7...30 ms: An input cycle causes the output to turn off. The IN1 or IN2 status
indicator is off and the output is off (even with automatic reset).
Repeated cycles of the input at less than 30 ms cause the output to be off or on, but a
true state is always present. An example in automatic reset: If the inputs are green, the
outputs are green, and if one of the inputs is off, the output is off.
• Cycles longer than 30 ms are processed properly.
Check the Single Wire
Safety Circuit (Step 4)
The Logic IN status indicator represents the single-wire safety (SWS) signal at terminal L12.
The SWS output is terminal L11.
Check the Logic IN status indicator.
SWS Connections L11 and L12
CI and SI safety relays only have SWS outputs (terminal L11); they do not have SWS inputs.
DI and DIS safety relays have both SWS input and output signals. If you have a DI or DIS safety
relay and the SWS input signal is not used, then the Logic IN status indicator is always off. If no
wire is connected to terminal L12, then make sure that the LOGIC switch is set is to either 1, 2,
5, or 6 (switch positions with OR logic).
EM or EMD expansion safety relays have both SWS input and output signals. You must connect
a wire to L12. Your application requirements determine whether L11 is used.
030
0 15
Channel 1
Channel 2
Open
Closed
Open
Closed
Time (ms)
Time (ms)
Channel 1
Channel 2
Open
Closed
Open
Closed
Time [ms] Time [ms]
Table 18 - Logic IN Status Indicator
Logic IN Status Indicator Status Action
Green L12 input is active (closed) See Check the Reset/Monitoring Circuit (Step 5)
on page 66
Off L12 input is inactive (open) See SWS Connections L11 and L12
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