GB - 18
Wiring Examples
6.3 Direct switching off by safety module with test pulses
U V W PE
M
X1A
X4A
1 - STO1+
2 - STO1-
3 - STO2+
4 - STO2-t
OPEN
CLOSED
S1 S2
Acknowledgment/
Quittung
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
X2A
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
X2B
①
②
③
④
①
Power Unit X1A Power terminal block
②
Control Circuit X2A Control terminal block
③
Safety component X2B STO terminal block
④
Safety module X4A Diagnostic interface
With operation of the emergency stop unit, e.g. by protection door, the release paths of the
safety module are disconnected. This leads to the loss of the STO signals (X2B.1 and 3) and
thus to energy disconnection of the drive. The safety module makes a consistency check of
all signal paths via test signals (OSSD).
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