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Table 3. Signal Descriptions (Continued)
Pin Number Wire Color* Signal
Description
5
Gray
Chassis Ground. This terminal is internally connected
to the C terminal.
* Wire color pertains to M125F power cables sold through NI. Other manufacturers' cable
wire colors may vary.
Power LED
The green POWER LED on the front panel identifies when the device is powered.
Table 4. LED State/Device Status
LED State
Device Status
On
Device is receiving adequate power for its tasks.
Off
Device is unpowered or receiving inadequate power.
Wiring External Power to the FieldDAQ Device
Complete the following steps to connect a power source to the FieldDAQ device.
1.
Verify the power source is turned off.
2.
If you are not using a pre-assembled cable, complete the following steps.
a.
Connect the positive lead of the primary power source to the V terminal (pin 1)
inside the power connector plug.
b.
Connect the negative lead of the primary power source to the C terminal (pin 3)
inside the power connector plug.
c.
Connect the Chassis Ground terminal (pin 5) inside the power connector plug to
earth ground. This terminal is internally connected to the C terminal.
d.
(Optional) To power non-FieldDAQ devices through the power network, connect the
leads of an additional auxiliary power source to the Aux1 (pin 4) and Aux2 (pin 2)
terminals inside the power connector plug.
e.
Assemble the rest of the plug sleeve.
3.
Carefully align and connect the cable to the external power source and the power IN
connector on the FieldDAQ device.
4.
Turn on the external power source.
If the power source is connected to the power connector using long wiring with high DC
resistance, the voltage at the power connector may be significantly lower than the specified
voltage of the power source.
FD-11634 User Guide
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© National Instruments
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Содержание FD-11634
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