Mitsubishi MELSEC Q Series Programming Manual page 546

LEDR
(2) Operations when an annunciator (F) is ON.
(a) When the CPU module has no LED display
The following operations will be conducted when the LEDR instruction is executed:
1) "USER" LED flickers, and is turned OFF
2) The annunciators (F) stored in SD62 and SD64 are reset, and the F numbers for
3) The data newly stored at SD64 is transmitted to SD62.
4) The data at SD63 is decremented by
SD62
SD63
SD64
SD65
SD66
SD67
SD78
SD79
(b) For CPUs with an LED display at the front
The following operations will be conducted when the LEDR instruction is executed:
1) The F number being displayed at the front of the CPU module will be reset.
2) "USER" LED flickers, and is turned off.
3) The annunciators (F) stored in SD62 and SD64 are reset, and the F numbers for
4) The data newly stored at SD64 is transmitted to SD62.
5) The data at SD63 is decremented by
6) The F number being stored at SD62 is displayed at the LED display. However, if the
SD62
SD63
SD64
SD65
SD66
SD67
SD78
SD79
7-172
SD65 to SD79 are moved up.
Before execution
200 SD62
Decrements 1.
15 SD63
200 SD64
99 SD65
5 SD66
255
SD77
83 SD78
0 SD79
SD65 to SD79 are compressed forwards.
value of SD63 is 0, nothing will be displayed.
Before execution
200 SD62
Decrements 1.
1 SD63
200 SD64
0 SD65
0 SD66
0
SD77
0 SD78
0 SD79
1. However, if SD63 is 0, it remains 0.
After execution
99
Number of registered F numbers
14
99
5
255
F number storage area
83
0
0
1. However, if SD63 is 0, it remains 0.
After execution
F number is not displayed on the
0
LED display unit since SD63 is 0.
0
0
Number of registered F numbers
0
0
0
0
0