Wiring the safety inputs

Attention

For SIL 3, PL e, cat.3 it is required to detect or prevent cabling faults. This can be achieved by:

• sending test pulses from the PLC OR

• ensure fault exclusion for wiring “Short circuit between any two conductors” according to ISO 13849- 2:2012 between signals STO-SBC 1 and STO SBC 2. The fault exclusion can be claimed by:

  • permanently connected (fixed) and protected against external damage, e.g. by cable ducting, armouring, OR

  • separate multicore cables, OR

  • installation within an electrical enclosure, OR

  • individually shielded with earth connection.

Cabling lenghts

Please observe the maximum allowed cable lengths:

Connection	Maximum wire length
STO-SBC	30 m

Connection diagrams for the STO inputs

Important

Please note that Safety GND is an isolated signal from drive GND.

Manual switch + drives

Allows safety functions up to SIL 3, PL e, cat.3.

Safety PLC PM (Plus-Minus output) + drives

Allows safety functions up to SIL 3, PL e, cat.3.

Note

Safety GND functions as a secondary line when a PLC with Plus-Minus output is used.

Attention

In case of multiple drive connection, ensure that the output driver has sufficient current driving capability.

Safety PLC PP (Plus-Plus output) + drives

Allows safety functions up to SIL 3, PL e, cat.3.

Attention

In case of multiple drive connection, ensure that the output driver has sufficient current driving capability.

Connection diagram for the brake

Now you are ready to use the feature:

Safety functions