On-Delays and Off-Delays
Each safety output can be configured to function with either an On-Delay or an Off-Delay (see
48), 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.
Safety Inputs
SO1
(On-Delay)
SO2
(Off-Delay)
Delay
500 ms
Delay
Figure 28. Timing Diagram—General Safety Output On-Delay and Off-Delay
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.
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 as shown in
on page 49. 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.
Figure 29. Example Safety Output Delay Selection: Off Delay
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.
XS/SC26-2 and SC10-2 Safety Controllers
48
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