NORSTAT Safety Relays Benutzerhandbuch
Seite 66
application guide safety relays from riese electronic
page 63
Logical AND circuit of two devices.
After opening the e-stop circuits of the 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
Contact extension over the emergency stop
circles.
See also application 6:
Logical AND circuit of
two devices.
up to category 4; SIL3; PLe reachable
S22
S12
K3
K4
B
34
14
safety
input
S32
S33
24
S11
K1
K2
K5
K6
14
A
C
24
14
safety
input
S37
S36
12k
S12
S22
S32
S33
24
S11
K1
K2
K3
K4
14
A
B
24
14
safety
input
S34
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