Power up mode
The Safety Output can be configured for three power-up scenarios (operational characteristics when power is
applied):
• Normal Power-Up Mode (default)
• Manual Power-up Mode
• Automatic Power-Up Mode
See Manual Reset Input and Latch Reset Block on page 30 for more information.
Split (Safety Outputs)
This option is only available for Solid-State Safety Outputs. Each redundant Solid-State Safety Output can be
configured to function individually or in pairs (default). Splitting a solid-state safety output creates two
independent single channel outputs (control of SO1a is independent of SO1b). To combine a split safety output,
open the Mx:SOxA Propeties window and click Join.
On-Delays and Off-Delays
Each safety output can be configured to function with either an On-Delay or an Off-Delay (see Figure 65 on page 85),
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 65. Timing Diagram—General Safety Output On-Delay and Off-Delay
WARNING: Off-Delays
A safety output Off-Delay time will be honored even if the safety input that caused the Off-Delay timer
to start changes back to the Run state before the delay time expires. However, in cases of a power
interruption or a power loss, an Off-Delay time can end immediately. If such an immediate
machine stop condition could cause a potential danger, additional safeguarding measures
must be taken 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. 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.
XS/SC26-2 Safety Controller
85
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