National Instruments FieldPoint FP-TB-10 Operating Instructions Manual page 14

Discrete Output Modules
(FP-DO-DC60, FP-DO-DC200,
FP-DO-AC120, and FP-DO-AC240)
The FP-DO-DC60, FP-DO-DC200, FP-DO-AC120, and
FP-DO-AC240 are discrete output modules. Each module
has two isolated channels, so applications requiring
channel-to-channel isolation can use both channels on each
module. Each module has two green indicator LEDs, one for each
channel, to indicate whether the channel is in the ON or the OFF
state. Each module also has two replaceable fuses—one for each
channel. The amount of current that each channel can drive without
exceeding temperature specifications depends on the ambient
temperature and the module type—see the
for more details. Because each channel of the DC output modules
is isolated, each can be used with either sinking or sourcing
devices. These modules sink current into the "a" terminals and
source current out of the "b" terminals. The following figures show
examples of this wiring. The AC output modules have
zero-crossing triac-style outputs that turn on as the voltage crosses
zero and turn off as the current crosses zero. If your application
does not require channel-to-channel isolation, you can use the V
and C terminals on the FP-TB-10 to bus-connect power supplies
for your loads.
FP-DO-DC xx
Connected as a
Sinking Output
Figure 16. Signal Connections for Discrete DC Output Modules
FP-TB-10 Operating Instructions
1a
Load
+
–
1b
2a
2b
Specifications
FP-DO-DC xx
Connected as a
Sourcing Output
14
section
1a
+
–
1b
Load
2a
2b
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