NORSTAT Safety Relays - Handbuch (Seite 84)

application guide safety relays from riese electronic page 80
Combination examples
Logical AND circuit of two devices.
After opening the release switch circuits of device A, the contactors
K1/K2 de-energise. Because the safety outputs of device A have
now a 0V-potential and the device B is configured for the AND-
combination (due to the open circuit S32), the contactors K3/K4 will
be de-energised over the S33 terminal (AND combination) too. If
only the release switch of device B will be opened, the contactors
K3/K4 will be de-energised only. The contactors K1/K2 remains in
energised condition. Hence device A de-energises all its following
devices.
up to category 4; SIL3; PLe reachable
S32
S33 24
S11
K1 K2 K3 K4
14
A B
24
14
safety
input safety
input
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