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© National Instruments Corporation A-1 PC-OPDIO-16 User Manual
Appendix A
Specifications
This appendix lists the specifications of the PC-OPDIO-16. These specifications are typical at 25°C and 50%
relative humidity unless otherwise stated. The operating temperature range is 0° to 50°C.
I/O Connector Electrical Specifications
Compatibility ...............................................................TTL-compatible
Configuration ...............................................................8 dedicated optically isolated digital input channels and
8 dedicated optically isolated digital output channels
Digital Input
Input Characteristics
Number of channels .....................................................8, each with its own ground reference isolated from other
channels.
Maximum input voltage...............................................24 VDC or 24 VAC
Digital logic levels .......................................................
Level Min Max
Input low voltage
(DC or Peak AC)
— ±1 V
Input high voltage
DC
1 kHz AC
±2 VDC
4 Vrms
±24 VDC
24 VAC
Input current
5 V inputs............................................................1.5 mA/channel
24 V inputs..........................................................7.0 mA/channel
Data transfer rate
1
.........................................................1 kHz
Isolation........................................................................24 VDC from computer ground
Digital Output
Output Characteristics
Number of channels .....................................................8, each with its own common reference and supply pins
isolated from other channels
Supply voltage range....................................................5 to 24 VDC
1
The input data transfer rates are limited by the switching characteristics (turn-on time, switching time, and turn-
off time) of the optical isolator used on the board. The transfer rates also depend on the computer, CPU speed,
and software used.