Description of the software
6.7 Functions
Modular Safety System 3RK3
162 System Manual, 10/2008, 926 2530-02 DS 02
Cross-circuit detection
A cross-circuit, which is a short-circuit between channels, can only occur with multi-channel
device controllers. Cross-circuit detection is only possible when the sensor is operated on
T1 / T2 of the relevant expansion module (see also
Guidelines for wiring the MSS
(Page
72)).
Since a cross-circuit is a Category 2 fault (wiring fault), a cross-circuit that has been rectified
must be acknowledged by means of a reset.
The following table provides an overview of cross-circuit detection for the monitoring
functions:
Monitoring function Cross-circuit detection Note
EMERGENCY STOP can be set to on/off
ESPE (electro-
sensitive protective
equipment)
can be set to on/off If the ESPE is equipped with solid-
state outputs, cross-circuit detection
must be deactivated.
Safety shutdown mat
(NC principle)
can be set to on/off
Safety shutdown mat
(cross-circuit principle)
On Cross-circuit detection must not be
activated for any other sensor on the
expansion module used.
Protective door can be set to on/off
Enabling button On
Two-hand operation can be set to on/off A two-hand control of type III C (Cat.
4) can only be implemented if cross-
circuit detection is activated.
Mode selector switch off
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