Pilz PNOZ s50 C - Manual (Page 18)

Function description
Operating Manual PNOZ s50
1002194­EN­02 18
4.2.3 Conditions for fast and slow shutdown
To shut down the power circuits, the following conditions must be met:
Shutdown Y10/Y11 S35 O1+/O1­
Fast 1/0 pulse edge 1 ­> 0
Slow 1 1/0 pulse edge ­> 0
Shutdown Y20/Y21 S36 O2+/O2­
Fast 1/0 pulse edge 1 ­> 0
Slow 1 1/0 pulse edge ­> 0
Y10/Y11
Y20/Y21
t
S35
S36
t
O1+/O1-
O2+/O2-
t
Fast Slow
t1 t2
Fast
Slow
t3 t4
Fig.: Conditions for fast and slow shutdown
NOTICE
Please note that a fast shutdown has priority over a slow shutdown. Only a
fast shutdown is safety­related.
Legend:
} Fast: Fast shutdown
} Slow: Slow shutdown
} t
1
:and t
3
Switch­on: Y10, Y11, S35 = 1, O1+/O1­ switches on; Y20, Y21, S36 = 1, O2+/
O2­ switches on
} t
2
: Fast shutdown via 1/0 pulse edge from Y10/Y11 or Y20/Y21
} t
4
: Slow shutdown via 1/0 pulse edge from S35 or S36
NOTICE
Please note that if there is a fault on the negative pole (O1­, O2­) of the
power circuit, the load only shuts down in single­pole mode. The load will
only execute a slow shutdown. The reaction time of the overall application
may be extended accordingly.