Exchanging The Upper And Lower Bytes Of 32-Bit Data - Mitsubishi Electric MELSEC iQ-F FX5 Programming Manual

Exchanging the upper and lower bytes of 32-bit data

DSWAP(P)
These instructions swap the value of 8 bits of the upper and lower bytes of the word devices specified by (d).
Ladder diagram
(d)
FBD/LD
EN ENO
d
Setting data
■Descriptions, ranges, and data types
Operand Description
(d) Head device for storing the data to be swapped
EN Execution condition
ENO Execution result
■Applicable devices
Operand Bit
X, Y, M, L, SM,
F, B, SB, S
(d) 
Processing details
These instructions swap the value of each of the upper and lower 8 bits of the device specified by (d) and (d)+1.
b15 b12 b11 b8 b7 b4 b3
∙∙∙ ∙∙∙ ∙∙∙
(d)+1
0 1 0 1 0 1 0 1 1 0 1 0 1
b15 b12 b11 b8 b7 b4 b3
∙∙∙ ∙∙∙ ∙∙∙
(d)+1 1 0 1 0 1 0 1 0 0 1 0 1 0
Precautions
If a continuous operation type instruction is used, swap is done in each operation cycle.
Operation error
There is no operation error.
Word
T, ST, C, D, W, U\G
SD, SW, R
 
b0 b15 b12
∙∙∙ ∙∙∙
(d)
0 1 0 0 1 0
b0 b15 b12
∙∙∙ ∙∙∙
1 0 1 (d) 1 0 1
Structured text
ENO:=DSWAP(EN,d);
ENO:=DSWAPP(EN,d);
Range



Double word Indirect
specification
Z LC LZ
   
b11 b8 b7 b4 b3 b0
∙∙∙ ∙∙∙ ∙∙∙
1 0 1 0 1 1 0 1 0 1 0 1 0
b11 b8 b7 b4 b3 b0
∙∙∙ ∙∙∙ ∙∙∙
0 1 0 1 0 0 1 0 1 0 1 0 1
Data type Data type (label)
32-bit signed binary ANY32
Bit BOOL
Bit BOOL
Constant
K, H E $
  
7 BASIC INSTRUCTIONS
7.7 Data Transfer Instructions
7
Others

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