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Input Circuit
Input Signal COS Timing Rules
Stop State—SO turns Off when3:
Run State—SO turns On when4:
Dual-Channel A and B Complementary
2 Terminals
3 Terminals
2 Terminals, PNP
24V
OFF
ON
At least 1 channel (A or B) input is in the
Stop state.
Simultaneous: A and B are both in the
Stop state and then both switch to the Run
state within 3 seconds before outputs turn
On.
Concurrent: A and B concurrently switch
to the Stop state, then both switch to the
Run state with no simultaneity to turn
outputs On.
Dual-Channel A and B
2-Ch, 2 Terminal
PNP
2-Ch, 2 Terminals
2-Ch, 3 Terminals
2-Ch, 4 Terminals
24V
ON
ON
2X Complementary A and B
4 Terminals
5 Terminals
PNP
24V
OFF
ON
OFF
ON
At least 1 channel (A or B) within a pair of
contacts is in the Stop state.
Simultaneous: A and B are concurrently in
the Stop state, then the contacts within a
channel switch to the Run state within 400
ms (150 ms for two-hand control), both
channels are in the Run state within 3
seconds (0.5 seconds for two-hand
control).
Concurrent: A and B are concurrently in
the Stop state, then contacts within a
channel in the Run state within 3 seconds.
There is no simultaneity requirement
between the switching of channel A and
channel B.
4-Wire Safety Mat
2-Ch, 4 Terminals
One of the following conditions is met:
•
Input channels are shorted
together (normal operation)
•
At least 1 of the wires is
disconnected
•
One of the normally low
channels is detected high
•
One of the normally high
channels is detected low
Each channel detects its own pulses.
Signal Debounce Times
Closed-to-Open Debounce Time (from 6 ms to 1000 ms in 1 ms intervals, except 6 ms to 1500 ms for mute sensors). The
closed-to-open debounce time is the time limit required for the input signal to transition from the high (24 V dc) state to the
steady low (0 V dc) state. This time limit may need to be increased in cases where high-magnitude device vibration, impact
shock, or switch noise conditions result in a need for longer signal transition times. If the debounce time is set too short
under these harsh conditions, the system may detect a signal disparity fault and lock out. The default setting is 6 ms.
CAUTION: Debounce and Response
Any changes in the debounce times may affect the Safety Output response (turn Off) time. This value is
computed and displayed for each Safety Output when a configuration is created.
Open-to-Closed Debounce Time (from 10 ms to 1000 ms in 1 ms intervals, except 10 ms to 1500 ms for mute sensors). The
open-to-closed debounce time is the time limit required for the input signal to transition from the low (0 V dc) state to the
steady high (24 V dc) state. This time limit may need to be increased in cases where high magnitude device vibration,
3 Safety Outputs turn Off when one of the controlling inputs is in the Stop state.
4 Safety Outputs turn On only when all of the controlling inputs are in the Run state and after a manual reset is performed (if any safety inputs are
configured for Manual reset and were in their Stop state).
XS/SC26-2 and SC10-2 Safety Controllers
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