Power Source (Isolated Power Connector) - National Instruments Compact FieldPoint cFP-20 Series User Manual

Chapter 3 Feature Descriptions

Power Source (Isolated Power Connector)

cFP-20xx and cFP-BP-x User Manual
Outputs 1 and 2 are tied to LEDs A and B, respectively, on the cFP-2020
front panel. Each output sources +5 V when the corresponding LED has a
value of 1. If the value is 0 or 2, the output does not source voltage. You can
use the outputs to provide status or alarm indicators to operators. For
example, if the Compact FieldPoint bank is mounted in a sealed enclosure,
you can connect the outputs to external LEDs so that operators can see
status information without opening the enclosure.
You can use the two switch inputs to control the cFP system from
LabVIEW. For example, one switch input could be a START/STOP switch,
and the other could determine which of two VIs should run at startup. NI
recommends connecting a single-pole single-throw (SPST) switch between
the input terminal and one of the C terminals. The switch inputs have a
value of 1 when the switch is closed and 0 when the switch is open.
Figure 3-5. Wiring the cFP-2020 External Input and Output Terminals
The cFP-20xx power connector is a 6-pin screw-terminal connector that
accommodates both primary and backup power supplies. The cFP-20xx
uses the power supply with the higher voltage level, indicating which
supply it is using on the channel called Power Source in software. A value
of 0 indicates the primary supply, and a value of 1 indicates the backup
supply. If the output voltages of the two power supplies are within
0.1–0.6 V of each other, the cFP-20xx can use either supply.
C
R2
O2
C
R1
O1
C
I2
C
I1
3-10
LED 2
LED 1
Switch 2
Switch 1
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