3. INSTRUCTION STRUCTURE
3
−
16
MELSEC-A
3.8.2 Instructions of variable functions
The following instructions vary in content of processing when used in the dedicated
instructions blocks for the AnA, A2AS, AnU, QCPU-A (A Mode) and A2USH board.
For details, refer to the AnSHCPU/AnACPU/AnUCPU Programming Manual
(Dedicated Instructions).
Instruction
Normal
In the Extension instruction Blocks
PRC Comment
output
MELSECNET/MINI-S3 support
instruction
FROM
DFRO
TO
DTO
Special function module
Device memory access
MELSECNET/MINI-S3 support
instruction
LEDA
LEDB
Unusable
Dedicated instruction start
LEDC
LED comment display
Device specification
DXNR
NOT exclusive logical sum operation
32-bit constant specification
LEDR
LED and annunciator clear
Dedicated instruction termination
SUB
Unusable
16-bit constant specification
REMARK
The dedicated instruction block of AnA, A2AS, AnU, QCPU-A (A Mode) and A2USH board is as
shown below.
Instructions other than those mentioned above cannot be used in the dedicated instruction
blocks.
X010
LEDA
LEDR
The instructions mentioned above
vary in function if used in this
section.
Specifies an dedicated instruction.
Summary of Contents for MELSEC-A series
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