44
EN
6. Expanding the Light Curtain System
6.1 Relay Unit
The SG4-00VA000R2 relay unit is equipped with two failsafe floating relay outputs. The terminals are con-
nected to the load circuit. The use of a spark arrestor significantly increases the service life of the relay
contact. Two-channel redundant wiring must also be observed when the relay unit is utilized. Both contacts
must be used for load current control.
Response times are increased by 8 ms when the relay unit is used.
Schematic Diagram, Relay Unit Connection
4
2
6
1
3
5
7
8
SG4-00VA000R2
1
2
3
4
5
6
7
8
9
10 11 12
13
15 16
14
15
9
10
12
12
14
7
8
1
2
4
3
6
5
24 V
Contactor Monitor
Plug Receiver
Acknowledge
0 V
Signal output
Earth/shield
PLC
OSSD 2
OSSD 1
24 V
0 V
