1.2.5.3 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.
1.2.5.3.1 Cabling lenghts
Please observe the maximum allowed cable lengths:
Connection Maximum wire
length
STO-SBC 30 m
1.2.5.3.2 Connection diagrams for the STO inputs
Important
Please note that Safety GND is an isolated signal from drive GND.
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