8
TROUBLESHOOTING
8 - 2
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
TRACKING CABLE
4
PROCEDURE FOR
STARTING UP A
REDUNDANT SYSTEM
5
REDUNDANT SYSTEM
FUNCTIONS
6
REDUNDANT SYSTEM
NETWORKS
7
PROGRAMMING
CAUTIONS
8
TROUBLESHOOTING
Table8.1 LED Names and Explanations (Continued)
No. Name Explanation
4) USER LED
On : An error has been detected with the CHK instruction, or annunciator F
turns on.
Off : Normal.
Flashing : Latch clear is executed.
5) BAT.LED
On : A battery error has occurred due to battery voltage drop in the CPU
module or memory card.
Off : Normal.
6) BOOT LED
On : Boot operation has started.
Off : Boot operation has not been executed.
Flashing : Automatic write to the standard ROM is completed. (The ERR.LED is also
flashing.)
7) BACKUP LED
Indicates the operation mode , i.e., backup mode or separate mode.
On (Green) : Backup mode.
On (Red) : Unable to continue the control (RUN) because of system switching.
On (Amber) : Separate mode.
Off : Debug mode.
Indicates as shown below, when the memory copy from control system to standby
system is being executed.
8) CONTROL LED
Indicates the system of the CPU module, i.e., control system or standby system.
On : Control system (System switching is possible, as the standby system is
normal.)Debug mode.
Off : Standby system.
9) SYSTEM A LED
Indicates the system A CPU module status.
On : Operating as system A
Debug mode
Flashing : The tracking cable has been disconnected while the CPU module is
normally operating as system A
(Flashing until the system A connector of the tracking cable is
connected.)
Off : Not operating as system A, i.e., operating as system B. (The SYSTEM B
LED is On.)
10) SYSTEM B LED
Indicates the system B CPU module status.
On : Operating as system B
Flashing : The tracking cable has been disconnected while the CPU module is
normally operating as system B.
(Flashing until the system B connector of the tracking cable is
connected.)
Off : Not operating as system B, i.e., operating as system A. (The SYSTEM A
LED is On.)
Debug mode.
Back up mode operation Separate mode operation
Executing memory copy
Memory copy successfully
completed
Control system Standby system
Lit (Red) Flashing (Red)
Lit (Red) Lit (Red)
Control system Standby system
Lit (Amber)
Flashing
(Amber)
Lit (Amber) Lit (Amber)
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