Upper And Lower Byte Exchanges (Swap, Swapp) - Mitsubishi MELSEC QCPU Programming Manual

6 BASIC INSTRUCTIONS

6.4.9 Upper and lower byte exchanges (SWAP, SWAPP)

Internal Devices
Set
(System, User)
Data
Bit Word
D
[Instruction Symbol] [Execution Condition]
SWAP
SWAPP
[Set Data]
Set Data
D
[Functions]
(1) Exchanges the higher and lower 8 bits of the device designated by
[Operation Errors]
(1) There are no operation errors associated with the SWAP(P) instruction.
[Program Example]
(1) The following program exchanges the higher 8 bits and lower 8 bits of R10 when X10 goes
ON.
[Ladder Mode]
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MELSECNET/10(H)
File Direct J \
Register
Bit
Command
Command
Head number of device where data is stored
b15 b12 b11
0 1 0 1 0 1 0 1
D
b15 b12 b11
1 0 1 0 1
D
b15 b12 b11
R10 0 0 0 0
b15 b12 b11
R10 1 1 1 1
QCPU
PLC CPU
Basic
High Performance
Usable Devices
Special
Function
Module
Word
U \G
Meaning
b8 b7 b4 b3 b0
1 0 1 0 1 0 1 0
b8 b7 b4 b3 b0
0 1 0 0 1 0 1 0 1 0 1
[List Mode]
Instruction
Steps
b8 b7 b4 b3 b0
0 0 0 0 1 1 1 1 1 1 1 1
b8 b7 b4 b3 b0
1 1 1 1 0 0 0 0 0 0 0 0
MELSEC-Q/QnA
QnA
Process CPU
Index
Constant
Register Other
K, H
Zn
SWAP D
SWAPP
D
Data Type
BIN 16 bits
.
D
Device
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Q4AR