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► Connect supply and ground cables to the controller and the sensors/actuators
via the respective common star point.
WARNING
The linking of connections in the plug is not permitted and can affect the safety of
operators and machinery.
sensor
sensor
sensor
X = not permissible
4.5 Interaction between inputs/outputs in an output group
In safety-related applications the following must be observed as regards the use of
the terminals as input and output.
► Do not combine inputs and outputs within an output group.
The background is a possible internal cross-connection of the outputs from
externally supplied inputs. This may occur unexpectedly if the supply to the
outputs is switched-off externally.
An output group is identified by a common VBB potential (here VBB
VBB
).
R
If, however, inputs and outputs are combined for optimisation of the terminals, an
internal cross-connection of the outputs is possible and thus, in the worst case, the
loss of the safety function of the outputs of this group.
supply
nn
input
nn
input
nn
input
controller
SafetyController CR7021
output nn
load
output nn
load
output nn
load
UK
and
O
9
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