2
Description of the safety function STO
Festo – GDCP-CMMS-AS-G2-S1-EN – 1306NH – English
21
2.4
Switching example SS1 – “Safe Stop 1”
In the function “Safe Stop 1” (SS1), the drive is run down in a controlled way and, after that, the power
supply to the final output stage is switched off. As a result, the drive cannot generate torque or any
force at rest and so cannot make any dangerous movements.
1
2
3
A1
S1
1
S1
2
S2
1
S2
2
S3
4
Y3
2
S1
22
21
A2
11
12
S2
+2
4
V
0
V
-X9
T1
21
9
DI
N4
DI
N5
-X1
RE
L
0
V
NC
2
NC
1
37
38
47
48
T1
13
14
T1
T1
Pilz PNOZ s5
T2
Festo CMMS-AS-...-G2
PE
In
put
T
3
ac
k
n
o
w
ledg
men
t
T1
N
24 V DC
0 V DC
Only relevant connections drawn
Out
put
T
3
co
nt
ro
lle
r
e
na
b
le
Out
put
T
3
h
a
rd
w
a
re
en
abl
e
13
14
L1
2
3
-X3
5
6
4
1
Motor controller with safety function
(T2, only relevant connections represented)
2
Safety switching device (T1)
3
Emergency stop switches
4
Inputs and outputs of the higher-order
controller (T3, 24 V)
Fig. 2.5
Circuit diagram for the safety function SS1
2.4.1
Explanations of the switching example
The switching example shows a combination of the CMMS-AS-...-G2 with a PNOZ s5 safety switching
device from Pilz. As switching device, a safety stop is drawn in combination with an emergency stop
switch. There remains the option to use a protective door switch with bolt that holds the protective
door close until the drive is at rest or the “driver supply feedback” signal displays the safe status and
the plausibility check is successful.
You can find technical data, such as max. current, etc., in the data sheet of the safety switching devices.