Safe torque off function 143
Single-channel connection
Wiring examples
An example of a Safe torque off wiring with internal +24 V DC power supply is shown
below.
+24 V
OUT1
SGND
IN2
K
IN1
Drive
Control unit
Notes:
• Both STO inputs (IN1, IN2) must be connected to the activation switch. Otherwise, no SIL/PL
classification is given.
• Pay special attention to avoiding any potential failure modes for the wiring. For example, use shielded
cable. For measures for fault exclusion of wiring, see eg. EN ISO 13849-2:2012, table D.4.
2414
2313 Y1
A2
Y2
A1
31
32
Safety relay
Safe PLC
OUT
GND
34
37
35
38
Drive
36 SGND
IN1
IN2
OUT1
OUT2
K
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