Delta Electronics Extension Digital I/O Module DOP-EXIO14RAE - Manual (Page 106)

Appendix D Use of Application Instructions|DOP-EXIO Series
Revision March, 2008, Doc. Name: 2007PDD23000014 D-25
Mnemonic Operands Function
XCH D D
1
D
2
Exchange
Bit Devices Word Devices
X Y M S K H KnX KnY KnM KnS T C D E F
D
1
D
2
y Note:
1. If D
1
and D
2
are used in device F, only 16-bit instruction is applicable.
16-bit instruction (5 Steps)
XCH
Continuous
execution
32-bit instruction (9 Steps)
DXCH
Continuous
execution
y Flags: None
Operands:
D
1 : Data to be exchanged 1
D
2 : Data to be exchanged 2
Explanations:
The contents in the devices designated by D
1
and D
2
will exchange.
Program Example 1:
When X0 = Off→On, the contents in D20 and D40 exchange with each other.
X0
D40 XCHP D20
Before
execution
After
execution
120
120 40
40 D20
D40
D20
D40
Program Example 2:
When X0 = Off → On, the contents in D100 and D200 exchange with each other.
X0
D200 D100
Before
execution
After
execution
40 20
D100
D101
D100
D101
20 40
D200
D201
D200
D201
DXCHP