FP-DIO-550 and cFP-DIO-550
8
ni.com
Digital Output Circuit
The [c]FP-DIO-550 digital output channels are optically isolated
from the rest of the FieldPoint bank. The channels are
sourcing
outputs, which means that the output terminal provides a path to
a voltage supply.
In the ON state, a transistor is turned on between the V terminal
and the V
OUT
terminal. In the OFF state, this transistor is turned off,
allowing only a small leakage current to flow.
Ensure that the load on any channel does not draw more than
250 mA.
Caution
Do not short-circuit outputs to C or COM
terminals. Short circuits can damage the outputs. Check
all wiring carefully before applying power.
In the ON state, the maximum effective resistance between the
V
OUT
terminal and the V terminal is 200 m
Ω
. This resistance
causes a voltage drop between the external supply voltage and the
output voltage. Table 3 lists the minimum output voltages based on
the voltage provided by the external power supply.
Table 3.
[c]FP-DIO-550 Output Voltages for 250 mA Current Flow
V
V
OUT
10
9.95
12
11.95
24
23.95
30
29.95
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