Manual – MOVIAXIS® MMD60B - Functional Safety
17
4
Connection of an external safety relay for STO
Connection Variants
4.3
Connection of an external safety relay for STO
The following figure shows a connection example with a safety relay and disconnection
of all poles:
The safety relay must be able to detect a short circuit against ground at the M output.
2950996875
[1] Installation space
[2] Safety relay
[3] Plug connector for STO
X50
STO
®
2
4
MOVIAXIS
MMD60B
[1]
[3]
DC +24 V
[2]
INFORMATION
When wiring the STO signals, possible faults in plug connectors and cables/lines have
to be considered (see ISO 13849-2) and the installation has to be designed according
to the required safety class. MOVIAXIS
®
MMD60B does not detect short circuits in the
supply line. SEW-EURODRIVE therefore recommends to connect only STO signals to
the STO input using a two-core cable, as shown in the figure.
