TROUBLESHOOTING
DIAGNOSTICS
I-E96-221A
5 - 7
Set pole 1 of dipswitch SW3 to 1 (OFF position) to put the mod-
ule into the diagnostic mode. Pole 2 of dipswitch SW3 is not
used in diagnostic mode. The remaining poles select module
address and Controlway or module bus. The function of each
pole of dipswitch SW3 is the same in either diagnostic or nor-
mal mode (except pole 2).
LED Display
The faceplate LEDs display test results during diagnostic mode
operation. See Figure
. On module reset, all eight LEDs illu-
minate. Next, the dipswitches are read, the selected test is exe-
cuted and the result is displayed on the LEDs. The format of
the LED display depends upon the setting of SW2, pole 1. If
this pole is in the ON position, the test number is displayed in
LEDs 1 through 6. LED 8 illuminates if the test fails. This dis-
play format is latched on for 1/4 second for viewing ease, then
the LEDs blank out for about 1/8 second, and the test is
repeated. If SW2, pole 1 is OFF, a running tally of successes
and failures will be displayed on the LEDs. LEDs 1 through 4
tally the passes, LEDs 5 through 8 the failures.
If a test fails with Halt-On Error selected (SW2, pole 2 OFF), the
status LED turns red one second after the test status is dis-
played.
For the group test (10), each test is run in numerical order. On
a failure, the test number that failed is displayed when the test
number display mode is selected. A failure of a test within the
group terminates the group test at that point. All tests after the
failing test in the group will not be run until the fault is
removed.
Figure 5-3. LEDs - Pass/Fail
DIPSWITCH SW3
POLE 1 ON
POLE 1 OFF
LEDS
TEST
NUMBER
NOT USED
TEST NUMBER
MODE FAIL
1
2
3
4
5
6
7
8
LEDS
FAIL/PASS
MODE PASS
COUNT
FAIL/PASS
MODE FAILURE
COUNT
1
2
3
4
5
6
7
8
LSB
LSB
MSB
MSB
T00060A
