©
National Instruments Corporation
15
cFP-20xx Quick Start Guide
6. Wire Power to the Compact FieldPoint System
Each cFP-20
xx
on your network requires an 11–30 VDC power supply.
1. Connect the positive lead of the primary
power supply to one of the V1 terminals
and the negative lead to one of the
C terminals.
2. If you are using a backup power supply,
connect the positive lead to V2 and the
negative lead to one of the C terminals.
The cFP-20
xx
uses the power supply
with the higher voltage level. V2 is
isolated from the other V terminals.
3. Refer to the operating instructions for the power requirements of each I/O
module.
4. Use a separate power supply for each module that needs external power.
Caution
Cascading power defeats isolation between the cascaded
modules.
C
V1
V2
+
–
+
–
11–30 VDC
Primary Power Supply
11–30 VDC Backup
Power Supply
(optional)
