Siemens SINUMERIK 840D Description Of Functions page 417

11.03
7.4.4 Protective door interlocking
The following circuit is used for monitoring the protective door if external
devices (hydraulics, cooling water etc.) have to be powered-down/disconnected
when the door is opened. The safety relay monitors the door switch and its
contacts are included in the switching logic for the SGEs of the Safety
Integrated functions.
Other contacts of the safety contactor switch all of the external devices (not
shown in this diagram) in the vicinity of the protective door that are potentially
hazardous to the operator.
If the protective door switch only activates and de-activates Safety Integrated
functions of the NC drives in the safety area, and this is clearly confirmed by
the risk analysis, then the contacts of the door switch can be directly integrated
into the switching logic for the SGEs (NCK/SPL) (see Fig. 7-26).
Safety Integrated monitors the door switch using the crosswise data
comparison of the SGEs.
Circuit diagram
Fig. 7-26
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
+24V
Door switch
L+ X1 X2
K3
L-
0V
Circuit diagram for protective door interlocking
Notes on the diagram
We recommend that a door release solenoid is used with a mechanical
system (as shown) that acts on the contacts of the checkback signals.
The protective door interlocking is evaluated as follows: Terminal X3 of the
safety relay is activated when the door is open and terminal X5 of the safety
relay when the door is closed.
7.4 Safety Integrated without SPL
open
Type:
closed
TZF
X3 X5
Safety relay
3TK2805
7 Configuring example
PLC
Q 48.0
SCHALT01.DSF
7-417