5
Appendix
Connection of an external safety relay for STO
Manual – MOVIGEAR
®
B
32
5.3
Connection of an external safety relay for STO
5.3.1
Connection via terminals
The following figure shows a connection example with a safety relay and disconnec-
tion of all poles:
[4]
[3]
[1]
DC +24 V
[2]
2 STO ̶ IN
1 STO + IN
12 STO ̶ OUT
11 STO + OUT
2468014347
[1]
Installation space
[2]
Safety relay
[3]
MOVIGEAR
®
B
[4]
Connection terminals for STO
5.3.2
Connection via M12 plug connector
The following figure shows a connection example with a safety relay and disconnec-
tion of all poles:
X5502
STO
[4]
2
4
[3]
[1]
DC +24 V
[2]
9007201723385995
[1]
Installation space
[2]
Safety relay
[3]
MOVIGEAR
®
B
[4]
Plug connector for STO
INFORMATION
When wiring the STO signals, possible faults in plug connectors and cables/lines
have to be considered (see EN ISO 13849-2) and the installation has to be designed
according to the required safety class. MOVIGEAR
®
does not detect short circuits in
the supply line. SEW‑EURODRIVE therefore recommends to connect only STO sig-
nals to the STO input using a two-core cable, as shown in the figure.
22746250/EN – 12/2016
