©
National Instruments Corp.
9
FP-AIO-600 and cFP-AIO-600
Note
Add a 2 A max fuse to any V
SUP
terminal in use.
Figure 9 shows how to connect one output channel of the
[c]FP-AIO-600 to a load.
Figure 9.
[c]FP-AIO-600 Analog Output Circuit
Output Ranges
You can configure each channel independently for an output range
of 0–20 or 4–20 mA. The default range setting for each channel is
0–20 mA, with the power-up output set to 0 mA. The
[c]FP-AIO-600 has overranging in each of these ranges, so
the full-scale ranges available are 0–21 mA and 3.5–21 mA.
Overranging enables the [c]FP-AIO-600 to compensate for span
and offset errors in field devices.
Open-Loop Detection
Each channel has a monitoring circuit that compares the actual
output current to the specified output current. If the [c]FP-AIO-600
cannot source the specified output current for one or more
channels, the monitoring circuits turn on a red
STATUS
LED for
each affected channel and report the error condition to the network
module. Generally, the error condition is caused by an open current
loop—either the load device or the external power supply is
disconnected. However, the monitoring circuit also detects errors
caused by load impedances that are too high and by external power
supply voltages that are too low. For more information, refer to the
Specifications
section.
V
SUP
I
OUT
COM
C
V
To Next Channel
+
–
10–30 VDC
External
Power Supply
2 A
Max
[c]FP-AIO-600
Load
Current
Source
Circuit
12-Bit
DAC
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