Connection Of Outputs; Connection Examples - ABB PLUTO Safety-PLC Operating Instructions Manual

7 Connection of outputs

Below are examples of output connections that give different degrees of protection against
short circuits. When and where they can be used depends on the kind of machine application
(risk) and the electrical installation.
7.1

Connection examples

Output examples 1: Connection and monitoring of contactors.
A
B
Q0
0V
A fault in a contactor will not lead to the loss of the safety function and is monitored since the
NC-contacts are connected to an input.
Note: Some short circuits from +24V and –24V can switch on both contactors and lead to loss
of the safety function.
The example connections can be used where the highest safety integrity level is not required
and the risk for short circuits is low or can be excluded e.g. inside a control cabinet. Example of
application is automatic machines where safety function is used by setting, adjustment etc.
A
Monitoring
B
I_/IQ_ Q2
+24V
/IQ_
(-)
(+)
35
Monitoring
I_/IQ_ 0V
+24V
/IQ_
(-)
(+)
2TLC172001M0211_A