NORSTAT Safety Relays - Handbuch (Seite 75)

application guide safety relays from riese electronic page 71
T34/ T11 K21
X1
T12 X2 13 PE/
B2 K22 23 77
START
Not-
Halt/
E-
STOP
c) RS-NAGT / RS-NAGT.1
Single channel emergency stop button
(without opposite polarity between channels)
With power applied to the unit, pressing the start
button activates the unit. Safety outputs 13-14,
23-24 and 77-78 close. Pressing the emergency
stop initiates a stop and outputs 13-14 and 23-24
open
immediately. The contact 77-78 remains closed
during the selected time delay. In this application,
the demand of redundancy in the emergency stop
is not accomplished.
Suitable up to category 2; SIL1; PLd reachable
Dual channel emergency stop (without
opposite polarity between channels)
For this application, terminals T12 and K22 are
not bridged. Instead, a redundant emergency
stop contact is applied. The function is shown in
application No. 1. In this application a fault in the
emergency stop is detected.
Suitable up to category 3; SIL2; PLd reachable
Dual channel emergency stop (with opposite
polarity between channels)
For this application, the terminal connection
PE/B2 and K21 are changed. By pressing the
start button the device will be activated. Terminals
13-14, 23-24 and 77-78 close. Pressing the
emergency stop initiates a stop and outputs 13-
14 and 23-24 open immediately. The contact 77-
78 remains closed during the selected time delay.
up to category …
immediate switching: 4; SIL3; PLe reachable,
time delayed output: 3; SIL2; PLd reachable
Not-
STOP
E-
Halt/
T34/ T11
X1
K22 X2 T12 K21 PE/
B2
13 23 77
S
TA
R
T
T34/
X1
T11 K22 X2 K21 T12 PE/
B2 13 23 77
S
TA
R
T
Not-
Halt/
E-
STOP
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