Wiring the safety inputs¶

Attention

For SIL 3, PL e, cat.3 it is required to send test pulses from the PLC to the output or to 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

permanently connected (fixed) and protected against external damage, e.g. by cable ducting, armouring, OR
separate multicore cables, OR
within an electrical enclosure, OR
individually shielded with earth connection.

Disabling the safety functions¶

When the safety functions are not used, it is necessary to bypass the safety module. To do so, please connect pins 1 and 6 of the safety module.

../../../../_images/STO-SBC_PLC_bypass.png

Cabling lenghts¶

Please observe the maximum allowed cable lengths:

Connection	Maximum wire length
STO-SBC	30 m
Bypassing the safety functions	3 m

Connection diagrams for the STO inputs¶

Important

Please note that Safety GND is a floating signal.