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FX Series Programmable Controlers

Applied Instructions 5

5-131

5.13.1

SWAP (FNC 147)

Contents:

The upper byte and the lower byte of the source
device are swapped.
This instruction is equivalent to operation 2 of FNC
17 XCH (see page 5-21).

Points to note:

a) In single word (16 bit) operation the upper and lower byte of the source device are

exchanged.

b) In double word (32 bit) operation the upper and lower byte of each or the two 16 bit devices

are exchanged.
Result of DSWAP(P) D10:

c) If the operation of this instruction is allowed to execute each scan, then the value of the

source device will swap back to its original value every other scan. The use of the pulse
modifier or an interlock program is recommended.

Mnemonic

Function

Operands

Program steps

SWAP
FNC 147
(Byte
Swap)

The high and low
byte of the
designated
devices are
exchanged

KnY, KnM, KnS, T, C, D, V, Z

SWAP,SWAPP
: 5 steps
DSWAP,
DSWAPP:
9 steps

0(S)

FX FX

(2C)

2N(C)

(2C)

2N(C)

0(s)

PULSE-P

(2C)

2N(C)

0(s)

16 BIT OPERATION

0(s)

(2C)

2N(C)

32 BIT OPERATION

X34

D10

SWAPP

D10

Byte 1

Values are in Hex for clarity

Byte 2

D11

Byte 1

Byte 2

Before DSWAP

After DSWAP