
APPENDICES
APP - 5
MELSEC-A
Appendix 1.1 Caution when Performing a Write while Running Dedicated Instruction
Description of write
performed when running.
For LEDA
For LEDB
Normal configuration is written
when running.
After write, the previous contact
turns on and the instruction is
executed.
After write, the instruction is
executed when the previous
contact is turned from OFF to
ON.
LEDA/LEDB was added by
mistake.
Error 104 occurs
(incorrect configuration).
If the previous contact stays
after write, the instruction is not
executed, so no process is
performed. When the previous
contact is turned from OFF to
ON, error 104 results.
LEDA/LEDB was deleted by
mistake.
The LEDC/SUB/LEDR is
processed as a regular
instruction.
Same as stated on left.
LEDC/SUB was added by
mistake.
Error 104 occurs
(incorrect configuration).
If the previous contact stays
after write, the instruction is not
executed, so no process is
performed. When the previous
contact is turned from OFF to
ON, error 104 results.
LEDC/SUB was deleted by
mistake.
Error 104 occurs
(incorrect configuration).
If the previous contact stays
after write, the instruction is not
executed, so no process is
performed. When the previous
contact is turned from OFF to
ON, error 104 results.
LEDR was added by mistake.
The latter LEDR is processed
as a regular instruction.
The latter LEDR is processed
as a regular instruction.
LEDR was deleted by mistake.
Error 104 occurs if LEDR does
not exist directly after the
deleted LEDR.
Error 104 occurs if LEDR does
not exist directly after the
deleted LEDR.
If LEDR exists, all instructions
in between are not executed.
REMARK
Detailed error code 104 indicates "the program configuration of the CC-Link dedicated instruction is
incorrect." (See Section 11.3.1.)
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