TROUBLESHOOTING
DIAGNOSTICS
6 - 2
I-E96-322A
®
DIAGNOSTICS
The IMHSS03 module firmware contains diagnostic routines
that can be invoked from power up. The diagnostic routines
allow verification of the module components and circuitry.
When the module is in diagnostic mode, it cannot perform the
functions of an IMHSS03 module. Therefore, diagnostics
should be used on modules that are off-line.
DIAGNOSTIC DIPSWITCH SELECTION
Pole one of dipswitch S1 puts the IMHSS03 module into diag-
nostic mode (see Figure
). Poles eight through five of
dipswitch S2 select the diagnostic test to run. Pole eight is the
least significant bit (binary weight one), pole five is the most
significant bit (binary weight eight). Test IDs range from zero to
nine. Refer to Table
for test ID values.
Pole one of dipswitch S2 selects the LED display mode. The
pass/fail mode displays a composite of the incrementing pass
and fail counters. LEDs one through four indicate the number
of passes successfully completed. LEDs five through eight dis-
play the number of failures (see Figure
).
The test number mode (pole one of dipswitch S2) displays the
diagnostic test number on LEDs one through four. LEDs five
through seven are not used; LED eight is the fail LED. The test
number and the pass/fail status of the test is displayed upon
completion (or failure) of the test. A passing test displays only
the test number. A failing test also turns LED eight on to indi-
cate a failure.
Pole two of dipswitch S2 selects the halt on error feature. In
this mode, the IMHSS03 module will halt test execution when-
ever the selected test detects an error. The number of the fail-
ing test is displayed on the IMHSS03 LEDs.
The front panel LEDs are used during diagnostic mode opera-
tion to display test results. On module reset, all eight LEDs
illuminate. Next, the dipswitches are read, the selected test is
executed and the result is displayed on the LEDs. The format
of the LED display depends upon the setting of dipswitch S2
pole one. If this pole is set to zero (on), the test number is dis-
played on LEDs one through four. LED eight illuminates if the
test fails. The test will repeat. If S2 pole one is set to one (off), a
running tally of successes and failures will be displayed on the
LEDs. LEDs one through four tally the passes, LEDs five
through eight the failures (see Figure
). If a test fails with
halt-on error selected (S2, pole two on), the status LED turns
red after the test status is displayed.
