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CHAPTER 6 NDA-24300
Page 460
Issue 1
SYSTEM OPERATIONS
• How to check the STATUS 7-segment LEDs
The ACT/STBY status of CPU can be confirmed by viewing the STATUS 7-segment LEDs.
Visually check the LED indications and confirm which CPU is active in your system.
When the STATUS LEDs display any of the two-digit numbers (00 - 99), the belonging CPU is
active. If the LEDs display the three letters (S, B and Y) in rotation, the CPU system is in STBY
mode. Note that the numbers (00 - 99), displayed on the active CPU front panel (DSP), conform
to the percentage points showing CPU occupancy rate.
Figure 6-41 How to Check STATUS LEDs
Note:
Except for the indication of the STATUS 7-segment LEDs, the ACT/STBY of the CPU also can be con-
firmed via the lamps on the DSP. If the CPU OPE lamp light steady-green and IMG0-3 are flashing,
the CPU is active. If CPU OPE appears OFF and IMG0 is flashing, the CPU is in STBY mode.
Legend
Lamp is ON
:
Lamp is OFF
:
Lamp is Flashing
:
Active
IMG1 IMG2
IMG3
CPUOPE
STATUS
WDT
IMG0
1
2
3
4
5
6
7
8
OFF
1
2
3
4
OFF
1
2
3
4
5
6
7
8
OFF
1
2
3
4
5
6
7
8
OFF
1
2
3
4
OFF
1
2
3
4
5
6
7
8
OFF
MBR
STATUS
4
C
0
2
6
A
E
4
C
0
2
6
A
E
ST-BY
IMG1 IMG2 IMG3
CPUOPE WDT
IMG0
MBR
DSP (Front View) DSP (Front View)
If the CPU is active, the
LEDs here indicate CPU
occupancy rate.
If the CPU is in ST-BY mode,
the left-side LED here goes
OFF and the right side beams
S, b and y in rotation.