Specifications

Theory of Operation
30
31007715 6/2008
To assure that the installation will perform to system specifications, it is advisable to
use a separate 24 VDC supply for logic power to the NIM and for field power to the
PDM:
1 24 VDC signal to the NIM’s logic power supply
2 24 VDC signal to the segment’s sensor bus
3 24 VDC signal to the segment’s actuator bus
4 optional relay on the actuator bus
If the I/O load on the island bus is low and the system is operating in a low-noise
environment, you may use the same supply for both logic power and field power:
1 24 VDC signal to the NIM’s logic power supply
2 24 VDC signal to the segment’s sensor bus
3 24 VDC signal to the segment’s actuator bus
4 optional relay on the actuator bus
NIM
24 V
24 V
OUT
OUT
OUT
P/S
24 VDC
24 V
5.0 V
5VDC
P/S
PDM
IN
24 V
IN
24 V
IN
24 V
24 V
24 V
24 VDC
P/S
24 VDC
24 VDC
1
2
3
4
NIM 24 V
24 V
OUT
OUT
OUT
P/S
24 V
5.0 V
5VDC
PDM
IN
24 V
IN
24 V
IN
24 V
24 V
24 V
24 VDC
P/S
24 VDC
24 VDC
1
2
3
4
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