5-10
Testing Your Board
16. Again, each bit set to ON in the
AIO Panel
should output a logic-
high signal at the corresponding I/O terminal, reading typically about
4 volts (minimum of 2.2 volts) at a DMM/DVM. Each bit set to OFF
in the
AIO Panel
should output a logic-low signal at the correspond-
ing I/O terminal, reading typically about 0 volts (maximum of
0.8 volts) at a DMM/DVM.
Note:
The typical values shown are valid for boards with TTL
compatible outputs. For boards with relay outputs (REL-16, PDISO-8,
and PIO-32) the output will be a relay contact closure. For boards with
open collector outputs (PIO-HV) use a pull up resistor to an appropriate
voltage to detect output state. Refer to the hardware description in this
user’s guide for more details on the output’s electrical specification.
●
If the bit patterns set on the
AIO Panel
do not agree with the
logic levels measured at the I/O terminals, the board is not
functioning properly. Stop here, and determine why.
●
If the bit patterns set on the
AIO Panel
do agree with the logic
levels measured at the I/O terminals, and you have performed an
output set test for all ports, the board is functioning properly.
17. Repeat steps 13, 14, and 15 for additional output channels.
Input Read Test
A similar test of input circuitry can be performed by applying an input
signal of suitable type to each input line and verifying that the appropriate
input indicator changes state. Refer to the hardware description in this
user’s guide for more details on the input’s electrical specifications.
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