48 Rockwell Automation Publication 440R-UM013E-EN-P - March 2017
Chapter 7 EMD Safety Relay Timing Functions
Jog
The jog function has two timers: an on-timer and an off-timer. The Range and
Time switch settings set the on-timer during configuration. The on-timer
starts when both the B1 terminal is connected to 24V DC and the logic link
signal at terminal L12 is on. The order in which these two signals turn on is not
relevant. When both signals are on, the safety outputs turn on during the on-
timer. After the on-timer expires, the safety outputs turn off and the off-timer
starts. The off-timer is fixed at 500 ms. After the safety outputs turn off, they
will remain off unit the off-timer elapses. Then the jog can be restarted.
Figure 35
shows three cases of timing sequences.
During the on-timer cycle, the Logic IN indicator flashes at a 1 Hz rate. During
the off-timer cycle, the Logic IN indicator flashes at an 8 Hz rate.
Figure 35 - Jog Timing Diagram
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.
TIP 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.
Case 1 Case 2 Case 3
Safety
Outputs
B1
tt
L12
t
12 3 456 7 12 1314158 9 10 11
t
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