Chapter 2
Installing the Hardware and Software
2-14
ni.com
for power requirement details. You can power a module by connecting
the V and C inputs on its terminal base to a separate power supply,
connecting the V and C outputs of a neighboring terminal base or
network module, or using a combination of both methods. If you want
to power field I/O devices from a terminal base, supply power to the
terminal base, and then connect the terminal base V and C output
terminals to the field device.
Figure 2-2 shows an example of a FieldPoint system correctly wired to
power sources.
Figure 2-2.
FieldPoint Bank with Power Connections
Calculating Power for a FieldPoint Bank
The power requirements for a FieldPoint bank that uses an FP-20
xx
network module are calculated as follows:
Power
= 4.5 W + 1.1 *
∑
(
I/O Module Consumption
)
This is the amount of power the FP-20
xx
network module consumes from
the power supply to power itself and the I/O modules. It does not include
any power consumed by devices that you wire to the terminal bases.
15 16 V
31 32 C
V 1
3
2
C 17 18
CAUTION: Cascading
power defeats isolation.
Shades of gray indicate
different voltage potentials.
FP-TC-120
FP-RLY-420
FP-AO-200
FP-AI-100
FP-2000
Separate Power Supply
(Recommended)
Cascaded Power
(Reduces Isolation)
No External
Power Required