National Instruments FieldPoint cFP-21 Series Quick Start Manual page 14

324033b.fm Page 14 Wednesday, September 14, 2005 2:09 PM
6. Wire Power to the Compact FieldPoint System
Each cFP-21xx 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-21xx 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.
cFP-21xx Quick Start Guide
11–30 VDC Backup
Power Supply
C
–
+
11–30 VDC
V 1
Primary Power Supply
V 2
14
(optional)
–
+
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