Specifications

I
2
C Input/Output Boards, Continued
There are eight AI circuits available on the AIO board. Analog inputs may
be either voltage or current based. The I
2
C I/O boards use two pins for AI
circuits. Setting for either voltage or current is accomplished using
jumper settings on the board, one jumper per circuit so that AIs on the
same board can be set differently. Shorting the jumper across the left
two pins engages a 50 ohm resistor across the inputs. This allows a 0 to
20mA input current to be measured.
Analog Inputs
Diagrams on the board indicate which jumpers correspond to which AIs.
Jumpers count from bottom to top and left to right (bottom left is AI1; top
left is AI4; bottom right is AI5; top right is AI8). Diagrams on the board
also indicate correct jumper settings for either current or voltage (install
jumper on right two pins for voltage, and left two pins for current).
There are two DI circuits available on the AIO board. DI circuits consist
of a +5V Signal lead and a Common lead. There is a 500V isolation
between the DI on the connector and the rest of the AIO board.
Digital Inputs
There is a DI mode switch on the AIO board. This switch is described in
the General Board Characteristics section for the I/O boards earlier in
this chapter.
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