Vacon optbj Safety Manual page 31

Commissioning
Figure 14. Structure of cable with two individually shielded twisted pairs
Safety actuator type
Undiagnosed safety actuator
(i.e. emergency stop button or
relay contact)
Safety actuator with diagnosed
outputs (i.e. safety PLC)
X = Not recommended due to causes of electromagnetic disturbances, safety actuator configuration or behavior
in failure situations.
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
Individual pair
Table 9. Recommended maximum cable lengths
Diagnostics on safety
actuator
No diagnostics
Outputs diagnosed using
e.g. dark test pulse,
light test pulse not used
Outputs diagnosed using
light test pulse
Overall shield Cable jacket
(Optional)
Pair shield
11860_uk
Used STO input connection
STO
Cable type
connection
example 1
Shielded X
Unshielded X
Shielded 200 m
Unshielded 30 m
Shielded 200 m
Unshielded 30 m
vacon • 31
STO STO
connection connection
example 2 example 3
200 m 200 m
30 m X
200 m 200 m
30 m X
X X
X X
6