Rockwell Automation 440R-S12R2 User Manual

40 Rockwell Automation Publication 440R-UM013F-EN-P - July 2021
Chapter 7 EMD Safety Relay Timing Functions
Case 3
10. The logic link signal at terminal L12 turns on, and the safety outputs turn
on within the specified reaction time.
11. The logic link signal turns off and the off-delay timer starts.
12. During off-delay time, the logic link signal turns off. A recoverable fault
occurs. The PWR/Fault indicator is green and flashing red four times.
13. The logic link turns back off. The fault continues to exist.
14. The off-delay time has elapsed; the safety outputs turn off; and the fault
is automatically cleared.
Off Delay, Retriggerable To use the retriggerable off-delay function, input terminal B1 must be
connected to terminal B2 before the configuration process. The off-delay timer
starts when the logic link signal at terminal L12 turns off. During the timing
cycle, the off-delay timer is automatically reset to zero when the logic link
turns back on. Figure 33
shows two cases of the timing sequences that can
occur with this configuration.
Figure 33 - Off-delay, Retriggerable Timing Diagram
Case 1
1. The logic link signal at terminal L12 turns on, and the safety outputs turn
on immediately (that is, within the specified reaction time).
2. The logic link signal turns off, and the off-delay timer starts.
3. The off-delay time has elapsed, and the safety outputs turn off.
Case 2
4. The logic link signal at terminal L12 turns on, and the safety outputs turn
on within the specified reaction time.
5. The logic link signal turns off, and the off-delay timer starts.
6. During off-delay time, the logic link signal turns on. The off-delay timer
is set back to zero, and the safety outputs remain on. No fault occurs.
7. The logic link signal turns off, and the off-delay timer starts.
8. The off-delay time has elapsed, and the safety outputs turn off.
On Delay To use the on-delay function, terminal B1 must be an open connection. The
on-delay timer starts when the logic link signal at terminal L12 turns on. The
safety outputs turn on after the delay time expires and remain on until the
logic link signal turns off. If the logic link signal turns off during the timing
cycle, the safety outputs turn off immediately. Figure 34 on page 41
shows two
cases of the timing sequences that can occur with this configuration.
t t t
12 3 4 567 8
Case 1 Case 2
L12
Safety
Output

Rockwell Automation 440R-S12R2 Specifications

General

Brand	Rockwell Automation
Model	440R-S12R2
Category	Relays
Language	English