National Instruments NI-9375 Getting Started page 4

The NI-9375 has sinking inputs. Sinking inputs provide a path to COM when
■
the sourcing device connected to the NI-9375 drives current or applies voltage
to DI.
The NI-9375 has sourcing outputs. Sourcing outputs drive current from
■
Vsup to DO when the channel is on.
Tip
For more information about sinking inputs and sourcing outputs, visit
ni.com/r/sinksource.
Allowable Current Per Module
The NI-9375 has a per module continuous output current specification. Use the
following equation to determine whether the total module current of your loads for
channels that are turned on are within the specification.
Figure 1. Total Module Current Equation
2 2
I + I
DO0 DO1
For example, an NI-9375 with spring terminal with two channels at 250 mA, six
channels at 125 mA, and eight channels at 62 mA has the following per module
continuous output current.
Figure 2. Total Module Current Example
2
250 mA * 2 + 125 mA
NI-9375 with Spring Terminal (Black Connector)
Pinout
4
ni.com
2
+ ... + I = Total Module Current
DO15
2
* 6 + 62 mA
2
2
* 8 = 0.25 A
NI-9375 Getting Started