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857 Relay
Active exported
+E
energy pulses
Reactive exported
+E q
energy pulses
Active imported
- E
energy pulses
Reactive imported
- E q
energy pulses
Figure 4.6 – Application example of wiring the energy pulse outputs to a PLC
having common plus and using an external wetting voltage
857 Relay
Active exported
+E
energy pulses
Reactive exported
+E q
energy pulses
Active imported
- E
energy pulses
Reactive imported
- E q
energy pulses
Figure 4.7 – Application example of wiring the energy pulse outputs to a PLC
having common minus and using an external wetting voltage
857 Relay
Active exported
+E
energy pulses
Reactive exported
+E q
energy pulses
Active imported
- E
energy pulses
Reactive imported
- E q
energy pulses
Figure 4.8 – Application example of wiring the energy pulse outputs to a PLC
having common minus and an internal wetting voltage
Supporting Functions
+
PLC
Pulse counter input
1
Pulse counter input
2
Pulse counter input
3
Pulse counter input
4
–
+
PLC
Pulse counter input
1
Pulse counter input
2
Pulse counter input
3
Pulse counter input
4
–
PLC
Pulse counter input
1
Pulse counter input
2
Pulse counter input
3
Pulse counter input
4
857-UM001A-EN-P – July 2009
4-19
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