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3.2.1
Category 4
A safety circuit configuration example of category 4 is shown below.
Category 4 safety circuit example
L1
AC IN
N1
Reset switch
S1
AUTO SERVICE
Maintenance switch
Input 1
S2
Input 2
Input 3
Door switch
Input 1
S3
Input 2
External emergency stop
Input 1
S4
Input 2
SAFETY
PB emergency stop
Input 1
Input 2
PB enable
Input 1
Input 2
+24V
GND
*1: Wiring to check whether the controller is normal when using an alarm to shut o the main power
Parts list
Circuit No.
S1
Reset switch
S2
Key selector switch
S3
Safety door switch
S4
Emergency stop switch
KM1, 2
Contactor (mirror contact)
Safety relay
KA1 to 5
Socket for safety relay
SRL1
Safety relay unit
SRL2
Safety relay unit
SRL3
Safety relay unit
SRL4
Safety relay unit
+24V
Service 1
Service 2
SRL1
L2
L1
M1
M1 M2
OUT
M2
OFF
ON
B
ON
OFF
A
T11
T12
T21
A
T22
Y1
T61
Enable 11
T62
Enable 12
T71
B
Enable 21
T72
Enable 22
Y2
T41
T42
+24V
SRL2
L2
L1
A2
T31 T32
T11
T12
T21
T22
Y1
T41
T42
+24V
SRL3
L1 A2 T31 T32
T11
T12
T21
T22
Y1
SRL4
T31 T32
T11
T12
T21
T22
T23
+24V
A
B
GND
Part name
KM1
KM2
GND
GND
+24V
T31
T32
T33
KA1
S14
S24
S44
S54
KA2
KA3
GND
GND
Service 1
Service 2
T33
S14
S24
S34
S44
S54
KA4
KA5
T33
S14
S24
GND
GND
13
14
23
24
33
Enable 11
34
Enable 12
43
Enable 21
44
Enable 22
Type No.
A22 series
OMRON
A22 TK series
OMRON
D4 series
OMRON
A22E series
OMRON
LC1-D18
Schneider Electric
G7SA-3A1B
OMRON
P7SA-10F-ND
OMRON
G9SX-GS226
OMRON
G9SX-AD322
OMRON
G9SX-BC202
OMRON
G9SA-GS501
OMRON
L
AC OUT
N
SAFETY
E-STOP24V
E-STOPRDY
MPRDY
*1
N.COM
SERVICE(DI02)
P.COM
OUT
PB emergency stop
Output 1
Output 2
PB enable
Output 1
Output 2
Manufacturer
2-17
2
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