OPERATING PROCEDURES
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I-E96-217A
®
Status LED Group
The status LED group indicates start-up and normal operation
conditions. During start-up, these LEDs can be observed to
determine the current on-line test (i.e., ROM or RAM) being run
and its result. During normal operation, these LEDS indicate
the current command and reply sequence between the com-
puter and SPM.
Start-Up LED Sequence
Figure
illustrates the LED sequence during start-up or
reset. When the SPM first starts up, the LEDs light and extin-
guish one at a time sequentially (i.e., LED test). When this test
is complete and all four LEDs are extinguished, the ROM test
runs. The top LED in the group lights indicating the comple-
tion of the ROM test and start of the RAM test. Then, all four
LEDs light to indicate completion of the RAM test and that the
SPM is ready and waiting for the first computer initiated com-
mand.
NOTE: A failure of either test results in a time out, which lights the
module status LED red.
Normal Operation LED
Sequence
After the start-up is complete, the LEDs maintain a binary
count of the computer command and SPM reply sequence.
Table 4-1. MSPM01 Module Status LED Indicator
LED
Indication
Solid Green
Powered up and operating properly
Off
No power
Solid Red
Machine fault timer error (
time out)
Figure 4-2. Status LED Group Sequence During Start-Up
LED TEST
ROM TEST RUNNING
ROM TEST COMPLETE, RAM
TEST RUNNING
RAM TEST COMPLETE, WAITING
FOR FIRST COMMAND
BEGIN
START-UP
SEQUENCE
END
START-UP
SEQUENCE
TP27275A