Description of the software
6.7 Functions
Modular Safety System 3RK3
System Manual, 10/2008, 926 2530-02 DS 02
161
● Safety shutdown mat (NC principle)
● Safety shutdown mat (cross-circuit principle)
Discrepancy monitoring
The discrepancy monitoring tolerates, within a defined time window, that associated signals
are not available at the same time. If this time is exceeded, an enable signal is not output.
The following table provides an overview of discrepancy monitoring for the monitoring
functions when they are connected to two-channel sensors:
Monitoring function Discrepancy monitoring Discrepancy time
EMERGENCY STOP On 5000 ms
ESPE (electro-sensitive protective
equipment)
On ∞
Safety shutdown mat (NC
principle)
On 5000 ms
Safety shutdown mat (cross-circuit
principle)
Off (cross-circuit same as with single
channel)
∞
Protective door can be set to on/off
∞ or
can be set from/to:
0...60000 ms,
Enabling button On ∞
Two-hand operation On 5000 ms
Mode selector switch off -
NOTICE
The configured discrepancy time of the "protective door" monitoring function must be
greater than the configured input delay because otherwise a discrepancy time violation may
occur with bouncing contacts, e.g. when the protective door is closed.
Note
The combination of "Discrepancy time monitoring on" and "Discrepancy time ∞" means that
no discrepancy time violation exists and, as such, no fault is triggered. The system cannot be
switched on, however, until after the discrepancy condition violation has been rectified.
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