ABB ACS880-07 - Single-Channel Connection of Activation Switch (BCU-X2); Single-Channel Connection of Activation Switch (UCU-22

￭
Single-channel connection of activation switch (BCU-x2)
+24 V
OUT
SGND
IN2
K
IN1
1
2
Note:
• Both STO inputs (IN1, IN2) must be connected to the activation switch. Otherwise, no SIL/PL classi-
fication 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.
Drive1
Control unit2
Activation switch
Note: A single-channel activation switch can limit the SIL/PL capability of the safety function
to a lower level than the SIL/PL capability of the STO function of the drive.
K
￭
Single-channel connection of activation switch (UCU-22…24)
OUT
SGND
STO1
STO2
+24 V
1
2
K
Note:
• Both STO inputs (STO1, STO2) 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.
Drive1
Control unit2
Activation switch
Note: A single-channel activation switch can limit the SIL/PL capability of the safety function
to a lower level than the SIL/PL capability of the STO function of the drive.
K
312 The Safe torque off function