National Instruments PC-OPDIO-16 Manuale Utente

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.

Compatibility ............................................................... TTL-compatible
Configuration ............................................................... 8 dedicated optically isolated digital input channels and

8 dedicated optically isolated digital output channels

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 .......................................................

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

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.