7.3 Direct switching off by safety module with test pulses
U V W PE
M
X1A
B+ B- T1 T2
X4BX4A X4C
STO1+
STO1-
STO2+
STO2-
SBC1+
SBC1-
SBC2+
SBC2-
Status STO
Status SBC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
X2A
S1 S2
Field bus Field bus
Diagnosis
Control circuit
Power circuit
Terminal strip X2B
Module type 1
Safety device
Acknowledgment
open
closed
Safety circuit
Figure 4: Direct switching off by safety module with test pulses
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 (STO1+ und STO2+) 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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