National Instruments IC-3121, User Manual, Page: 12 / 33

Table 6. Digital I/O Pin Descriptions (Continued)
Pin Number Signal Description
31 Iso In 0 General purpose isolated input
32 iso In 1 General purpose isolated input
33 C
ISO
Common ground reference for isolated inputs and outputs
34 Iso In 2 General purpose isolated input
35 Iso In 3 General purpose isolated input
36 C
ISO
Common ground reference for isolated inputs and outputs
37 Iso In 4 General purpose isolated input
38 Iso In 5 General purpose isolated input
39 C
ISO
Common ground reference for isolated inputs and outputs
40 Iso In 6 General purpose isolated input
41 Iso In 7 General purpose isolated input
42 C
ISO
Common ground reference for isolated inputs and outputs
43 Iso Out 6 General purpose isolated output
44 Iso Out 7 General purpose isolated output
Wiring an Isolated Input
You can wire an isolated input to a sourcing output device.
Caution Do not allow the voltage on the isolated inputs to exceed 30 VDC. Doing
so will damage the IC-3121.
Figure 10. Connecting an Isolated Input to a Sourcing Output Device
V
REF
C
ISO
Industrial Controller
Input
Sourcing
Output
Device
Current
Limiter
Power Supply
+
–
IC-3121 User Manual
|
© National Instruments
|
11