7-Segment Leds On The Control Unit; Normal State Display; Error Display At Nc Startup - Mitsubishi Electric M80 Series Maintenance Manual

M800/M80/E80 Series Maintenance Manual
1 System Basic Configuration

1.4.6 7-segment LEDs on the Control Unit

The 7-segment LEDs mounted on the control unit can display NC status.
When alarms occur, an alarm with the highest priority within each part system is displayed.

1.4.6.1 Normal State Display

In normal state, the 7-segment LEDs display

1.4.6.2 Error Display at NC Startup

If an error occurs at NC start up, the 7-segment LEDs change as follows.
The state of sub CPU (NCLD2) is displayed on the left and that of the main CPU (NCLD1) is displayed on the right by two
7-segment LEDs.
Take a note of the displayed contents and contact the Service Center.
NCLD2 NCLD1
Main CPU
Sub CPU
LED display
E
F
d
U
A
C
G
. (Period)
(cf) In case of SRAM clear, the 7-segment LEDs change as follows. (RSW2: "C")
LED display
y
c
Undefined interruption occurred
Bus error, address error or interrupt exception (ASIC)
Memory test error in DRAM
Unsupported H/W
CRC check error occurred (Boot ROM, FROM entry, OS, EEPROM)
Sequence error occurred at OS startup
Initialization error in graphic controller
No correct boot data in flash ROM
Memory test pass in SRAM
Memory test error in SRAM
in flashing.
Cause
Cause
31 IB-1501273-F