Mitsubishi Electric MELSEC-Q/L - Error Display and Annunciator Reset

518
7 APPLICATION INSTRUCTIONS
7.9 Display Instructions
Error display and annunciator reset
LEDR
Processing details
• Resets the self-diagnosis error display so that annunciator display or operation can be continued. With one execution of
this instruction, either error display or annunciator is reset.
■Operation when self-diagnosis error is generated
• If the self-diagnosis error is one which allows continued operation
If there is an indication of the self-diagnosis error which the CPU module can continue the operation, reset the "ERR." LED in
front of the CPU module.
It will be necessary to reset SM0, SM1, and SD0 at the user program, because they are not reset automatically.
Since the cause of the error displayed at this time has a higher priority over annunciator, no action for resetting the
annunciator is taken.
• When a battery error is generated.
If the LEDR instruction is executed after the battery is changed, the "BAT." LED in front of the CPU module is reset.
SM51 is also turned OFF at this time.
■Operations when an annunciator (F) is ON.
When the LEDR instruction is executed, the following operations are performed.
Setting
data
Internal device R, ZR J\ U\G Zn Constant Others
Bit Word Bit Word

• "USER" LED flickers, and is turned OFF
• The annunciators (F) stored in SD62 and SD64 are reset, and the F numbers for SD65 to SD79 are moved up.
• The data newly stored at SD64 is transmitted to SD62.
• The data at SD63 is decremented by 1. However, if SD63 is 0, it remains 0.
Process
High
performance
Redundant Universal LCPU
Basic
Command
LEDR
LEDR
Before execution
200
15
200
99
5
255
83
0
SD62
SD63
SD64
SD65
SD66
SD67
SD78
SD79
After execution
99
14
99
5
255
83
0
0
SD62
SD63
SD64
SD65
SD66
SD77
SD78
SD79
F number storage area
Number of registered F numbers
Decrements 1.