Siemens SINUMERIK 840D Description Of Functions page 384

7 Configuring example
7.3 Safety Integrated with SPL
Circuit diagram
Fig. 7-8
Description Emergency Stop is acknowledged through two channels using an
acknowledgment button. This is connected to the +24 V power supply. The
safety guidelines published by the German Institute for Occupational Safety
state that this switch must be configured using two channels.
If additional checkback signals (e.g. AS1/AS2) have to be included in the
acknowledgement function, then these contacts should be included in the 24 V
power supply of the two-channel acknowledgement button.
Circuit diagram
Fig. 7-9
7-384
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
PLC
Q48.2
K1
NCK
O1
K2
Disconnecting the power
+24V
PLC
I76.3
Emergency Stop acknowledgment
+24V
-230V
13 21
14 22
13 21
PLC
14 22
I76.4
M
21
11
Acknowledge-
ment switch
12 22
© Siemens AG 2003 All Rights Reserved
11.03
NCK
I4