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TROUBLESHOOTING
ON-BOARD DIAGNOSTICS
I-E96-213A
6 - 3
ON-BOARD DIAGNOSTICS
The on-line diagnostics feature is another troubleshooting tool.
This tool enables the user to verify the module's components
and circuitry.
Diagnostic routines are selected with the module's
dipswitches; results are displayed on the front panel LEDs.
Tests can be run once or continuously, by group or
individually.
A typical example: The user sets the dipswitches to select a
test, resets the module, and observes the results on the LEDS.
He then selects another test.
Some diagnostic tests require an additional module (e.g., slave
or another MFC).
Setup and explanations are explained in subsequent
paragraphs.
Switch Selection
Switches SW 3 and SW 4 are used to determine which diagnos-
tic test to run, and how to run it. See Figure
for switch
locations.
SW 3 pole 1 must always be in the 1 (OFF/OPEN) position. Pole
2 must be set to the 1 (OFF/OPEN) position to put the MFC in
the Diagnostic Mode. Poles 3 through 8 are not used in diag-
nostics except in the Module Address Select Test (Test ID 14).
SW 4 poles 1 through 6 select the diagnostic test to run. Pole 1
is the least significant bit (LSB) with a binary weight of 1, while
pole 6 is the most significant bit (MSB) with a binary weight of
32. Refer to Table
for test IDs and Table
for digital slave
setup for diagnostics IDs.
SW 4 pole 7 selects a HALT ON ERROR feature when continu-
ous operation is selected.
SW 4 pole 8 selects continuous mode which means the selected
test is executed continuously. Each successful completion of
the test increments a test pass counter and is displayed on the
front panel LEDs (likewise for failures).