354 The Safe torque off function
Single inverter unit (internal power supply)
Dual-channel connection
Single-channel connection
+24 V
OUT1
SGND
IN2
U2, V2, W2
Control logic
UDC+
UDC–
Inverter unit
Control unit
A
K
IN1
+24 V
OUT1
SGND
IN2
K
IN1
Inverter unit
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.
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