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5
5-7GFK-0787B Chapter 5 Diagnostics
Discrete Output Autotest
Discrete output autotest checks the ability of outputs to respond to the commanded output
state.
Load
Bus A Bus BBus C
A
B
CD
The discrete output autotest will:
work on outputs that are either on or off, with or without load monitoring.
for normally deenergized outputs that are off when tested, the test detects:
Open Circuit load (if No-load Diagnostic is enabled)
Block A/B short to 0V
Block C/D short to 24V
Any single block open circuit (if No-load Diagnostic is enabled)
Any single block Switch Failed off
for normally deenergized outputs that are on when tested, the test detects:
Open Circuit load (if No-load Diagnostic is enabled)
Any single block open circuit (more precise if No-load Diagnostic is enabled)
Any single block Switch Failed off
for normally energized outputs that are off when tested, the test detects:
Block A/B short to 0V
Block C/D short to 24V
Any single block Switch Failed off
for normally energized outputs that are on when tested, the test detects:
Open Circuit load (if No-load Diagnostic monitoring is enabled)
Any single block open circuit (more precise if No-load Diagnostic is enabled)
Block A/B short to 24
Block C/D short to 0V
Any single block Switch Failed off
Any single block Switch Failed on
detect any output failure that would result in a failure to respond.
although no test results are generated if outputs change state during the test, it does
not cause spurious faults to be logged.
During output autotest, the Genius block group still controls the physical outputs, so output
devices are not affected by the test.