3
Mounting and installation
Festo – GDCP-CMMP-AS-M0-S1-EN – 1412a – English
23
3.3
Typical circuits
3.3.1
Safe torque switch off (STO, “Safe Torque Off ”)
1
2
3
4
5
L230VAC
N230VAC
PE
DC 24 V
T1
CMMP-AS-…-3A-M0
1
2
7
8
9
L1
PE
+24V
G
N
D24V
N
-X9
21
9
DI
N
4
DI
N 5
-X1
1
3
2
4
ST
O-A
ST
O-B
0V-B
0V-A
-X40
Output
PL
C:
Output stage enable
Output PL
C:
Controller enable
Only the relevant connections are drawn!
Without cross-circuit detection!
DC 0 V
5
6
C1
C2
Input
PL
C:
Safety acknowledgment T1
S1
sender
receiver
OSSD1
OSSD2
S1
S1
S1
Safety coupling
switch device
1
3
2
4
1
3
4
2
1
3
4
2
1
3
4
2
or
or
1
Motor controller with safety function
(only relevant connections shown)
2
Emergency stop switches
3
Protective door
4
Light curtain
5
Safety relay
Fig. 3.1
Connection of the integrated safety function, example of a single-phase
CMMP-AS-...-3A-M0 motor controller
The safety function “Safe torque off ” (STO) can be requested via various devices. Switch 1 can be used
e.g. as an emergency stop switch, a light curtain or a safety switching device. The safety request is
made in 2 channels via switch S1 and routes to the 2-channel switch-off of the output stage. Once the
output stage has been switched off, it is output by the floating contact C1/C2.
Notes with regard to a typical circuit:
–
The motor controller with integrated safety function does not feature any cross-circuit detection.
In the case of direct light curtain wiring, the light curtain detects cross-circuits if designed to do so.
–
When using safety switch devices, the contacts C1, C2 can be integrated in the feedback circuit of
the safety switch device.
–
The typical circuit exhibits a 2-channel structure, which is suitable for categories 3 and 4 with addi
tional measures.
–
Which additional measures are required depends on the range of applications and the safety
concept of the machine.
