
TROUBLESHOOTING
DIAGNOSTICS
I-E96-613A
5 - 9
LED Display
The front panel LEDs (see Figure
) are used during diagnos-
tic mode operation to display test results.
On module reset, all front panel LEDs turn on. Next, the IPT
module reads the dipswitches, executes the selected test and
displays the result on the group A and group B LEDs. Group B
LEDs display the test number on LEDs one through six. If LED
eight is on, the test failed. The display is latched on for
1
/
4
-sec-
ond for viewing ease, then the LEDs blank out for about
1
/
8
-second, and the test is repeated. Group A LEDs display a
running tally of successes and failures. LEDs one through four
tally the passes, LEDs five through eight tally the failures.
If a test fails with the halt-on error feature selected (dipswitch
SW1, pole one ON), the status LED turns red. The test number
that failed is displayed on the group B LEDs.
For group tests (10, 20), each test is run in numerical order.
On a failure, group B LED eight (see Figure
) flashes and
LEDs one through six display the test number that failed.
When all tests in the group are done, the error count is incre-
mented and displayed on the group A LEDs.
Remote RS-232-C, DUART 1
11
Verifies RS-232-C line drivers and receivers for data and
handshake lines connected to DUART 1. Requires loopback
jumpers for data and handshake lines.
Remote RS-232-C, DUART 2
12
Verifies RS-232-C line drivers and receivers for data and
handshake lines connected to DUART 2. Requires loopback
jumpers for data and handshake lines.
Expander bus communications
13
Verifies expander bus communication with digital output.
Unused
14-1F
–
Group test 2
20
Executes tests 01 through 1F in a loop until stopped.
Long RAM
21
Performs test 03 plus walking-1 and walking-0 tests to verify
RAM operation.
NVRAM data detection
22
Reads NVRAM for pattern set in test 04. Interruption of power
between test 04 and test 22 is preferred.
Real time clock NVRAM data
retention
23
Reads real time clock NVRAM for pattern set in test 09. Inter-
ruption of power between test 09 and test 22 is preferred.
Machine fault timer
24
Verifies correct operation of machine fault timer.
Stop/reset pushbutton
25
Verifies correct operation of stop/reset pushbutton.
Expander bus assassin
26
Verifies correct operation of expander bus assassin circuit.
NOTE:
1. Must have the IMMPI01 I/O module installed to pass.
Table 5-13. Diagnostic Tests
(continued)
Test Name
Test-ID
Description