Programmable Safety Controller SCR P
42
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On-Delays and Off-Delays
Each safety output can be configured to function with either an On-Delay or an Off-Delay (see
on p.42),
where the output turns On or Off only after the time limit has elapsed. An output cannot have both On- and Off-
Delays. The On- and Off-Delay time limit options range from 100 milliseconds to 5 minutes, in 1 millisecond
increments.
Figure 22: Timing Diagram
—General Safety Output On-Delay and Off-Delay
Two Safety Outputs can be linked together when one of the Safety Outputs is configured for an Off-Delay, and the other does not have a delay. After
it is linked, the non-delayed output does not immediately turn back on if the controlling input turns on during the Off Delay. To link two Safety
Outputs:
1. Open the
Properties
window of the Safety Output that needs to have an Off-Delay.
2. Select "Off-Delay" from the
Safety Output Delay
drop-down list.
3. Set the desired Output Delay time.
4. Click
OK
.
5. Open the
Properties
window of the Safety Output that will link to the Safety Output with an Off-Delay.
6. From
Link to Safety Output
drop-down list, select the Safety Output with an Off-Delay to which you wish to link this
Safety Output.
WARNING:
•
With a power interruption or loss, an OFF-delay time can end immediately.
• Failure to follow these instructions could result in serious injury or death.
• The safety output OFF-delay time is honored even if the safety input that caused the OFF-delay
timer to start switches back to the Run state before the delay time expires. If such an immediate
machine stop condition could cause a potential danger, taken additional safeguarding measures
to prevent injuries.
Figure 23: Example Safety Output Delay Selection: Off Delay
