5

Discrete Output Autotest

Discrete output autotest checks the ability of outputs to respond to the commanded output state.

Bus A Bus C

Bus B

A

B

Load

C

D

The discrete output autotest will:

Hwork on outputs that are either on or off, with or without load monitoring.

h 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

hfor 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

hfor 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

hfor 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

Hdetect any output failure that would result in a failure to respond.

Halthough 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.

GFK-0787B

Chapter 5 Diagnostics

5-7

Page 67
Image 67
GE GFK-0787B user manual Discrete Output Autotest