42 Rockwell Automation Publication 440R-UM013F-EN-P - July 2021
Chapter 7 EMD Safety Relay Timing Functions
Case 1
1. The logic link signal at terminal L12 turns on.
2. The B1 terminal turns on. The jog on-timer starts, and the safety outputs
turn on.
3. The jog on-timer elapses, and the safety outputs turn off. The jog
off-timer starts.
4. After 500 ms, the jog function is complete.
5. The B1 inputs turn off.
6. With the logic link input still on, the jog function is repeated when the B1
signal turns on.
7. The logic link signal turns off.
Case 2
8. The B1 signal turns on before the logic link signal.
9. The logic link signal turns on. The jog on-timer starts, and the safety
outputs turn on.
10. The B1 signal turns off before on-timer elapses. The safety outputs turn
off immediately and the off-timer starts.
11. The off-timer elapses. The logic link signal turns off to end Case 2.
Case 3
12. The logic link signal at terminal L12 is on. The B1 signal turns on. The jog
on-timer starts, and the safety outputs turn on.
13. The on-timer elapses and the safety outputs turn off. The off-timer starts.
14. During the off-timer cycle, the B1 signal is turned off and then quickly
back on. The safety outputs remain off.
15. The B1 signal must turn off before a new jog cycle can begin.
The L12 and B1 signals are interchangeable. The B1 signal can remain on and the
L12 turns on and off to execute the jog function.
The L12 and B1 signals are interchangeable. If the B1 signal remains on and the L12
turns off before the on-timer elapses, the safety outputs turn off immediately.
The L12 and B1 signals are interchangeable. At least one of these two signals must
remain off throughout the off-timer cycle before a new jog cycle begins.
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