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

Manual switch + drive

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

../../../../_images/STO-SBC_switch.png

Manual switch + drive (single-channel)

Allows safety functions up to SIL 1, PL c, cat. 1.

../../../../_images/STO-SBC_single_switch1.png

Manual switch + multiple drives

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

../../../../_images/STO-SBC_switch_nth1.png

Safety PLC PM (Plus-Minus output) + drive

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

For example: Safety PLC digital output

../../../../_images/STO-SBC_PLC_PM1.png

Safety PLC PM (Plus-Minus output) + multiple drives

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

../../../../_images/STO-SBC_PLC_PM_nth1.png

Attention

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

Safety PLC PP (Plus-Plus output) + drive

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

For example: Safety PLC output or safety sensors (e.g. Safety light curtain, safety scanner etc.)

../../../../_images/STO-SBC_PLC_PP1.png

Safety PLC PP (Plus-Plus output) + multiple drives

Allows safety functions up to SIL 3, PL e, cat.3.
../../../../_images/STO-SBC_PLC_PP_nth1.png

Attention

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

Connection diagram for the brake

Attention

When using a safe brake:

  • use the SBC out instead of phase D of the Drive module.
  • ensure to connect it to Brake- of the SBC out instead of a general GND
../../../../_images/STO-SBC_wiring_brake1.png

Now you are ready to use the feature: