Page 7.3
32-CHANNEL DIGITAL I/O MODULE 40-412
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SECTION 7 - MAINTENANCE INFORMATION
TEST PROCEDURE
The test can be automated or can be conducted using the SFP supplied.
Digital Input Test
The following test is conducted with the drivers all set to off.
et the voltage source to
he fi ture otential divider out ut will now e
Set both input Threshold voltages to 0.5V. Check that the responses are all low for all the 32 channels.
NOTE:
When using the Soft Front Panel, a threshold voltage of 0.5V equates to 101000 in binary
ee igure
et the voltage source to
he fi ture otential divider out ut will now e
Set both input Threshold voltages to 9.5V. Check that the responses are all high for all the 32 channels.
Set Threshold Voltage 1 to 9.5V and Threshold Voltage 2 to 10.5V. Check all responses from Threshold
Voltage 1 are high and all from Threshold Voltage 2 are low.
NOTE:
When using the Soft Front Panel, a threshold voltage of 9.5V equates to 1011111000 in binary
ee igure
Also, a threshold voltage of 10.5V equates to 1101001000 in binary
Set Threshold Voltage 1 to 10.5V and Threshold Voltage 2 to 9.5V. Check all responses from Threshold
Voltage 1 are low and all from Threshold Voltage 2 are high.
Set Threshold Voltage 1 and 2 to 10.5. Check all responses are high.
Figure 7.2 - Using Soft Front Panel To Set a Threshold of 0.5V (101000 in Binary)
