Description of the software
6.6 Logic diagram
Modular Safety System 3RK3
System Manual, 10/2008, 926 2530-02 DS 02
157
Monitoring functions
● Only fail-safe signals must be connected to a signal input (INx) of a monitoring function.
● "Mixed connection" of signals is not possible, i.e. for multi-channel functions capable of
cross-circuit detection, only channels of the same module can be connected. (Comment:
mode selector switch).
Note
For cross-circuit detection, channels are assigned to "channel groups" on central units or
expansion modules:
Channel group 1: IN1/IN2
Channel group 2: IN3/IN4
Channel group 3: IN5/IN6
Channel group 4: IN7/IN8
● The following rules apply for interconnecting channels on these modules to multi-channel
monitoring functions with the exception of the mode selector switch:
– If an input in a channel group is used with one channel, the assigned second input
must no longer be used with two channels. It can still be used with one channel.
– If an input of a channel group is used with two channels, the second associated input
is automatically configured to the still unused input of the element (e.g. emergency
stop: IN1 is configured to SLOT3_F-IN1, IN2 is automatically assigned to SLOT3_F-
IN2).
The test cycle inputs for detecting cross-circuits are assigned as follows:
T1: IN1 IN3 IN5 IN7
T2: IN2 IN4 IN6 IN8
Note
A 2-channel enabling button can only be connected via the test cycle.
NOTICE
If a safety shutdown mat (cross-circuit principle) is connected to a slot (expansion
module or central unit), cross-circuit detection must be deactivated for the remaining
inputs on this slot because otherwise the monitoring functions configured for these
inputs will also signal a cross-circuit when somebody steps on the safety shutdown
mat.
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