Delta Electronics Extension Digital I/O Module DOP-EXIO14RAE - Manual (Page 132)

Appendix D Use of Application Instructions|DOP-EXIO Series
Revision March, 2008, Doc. Name: 2007PDD23000014 D-51
Mnemonic Operands Function
SFTR S D n
1
n
2
Bit Shift Right
Bit Devices Word Devices
X Y M S K H KnX KnY KnM KnS T C D E F
S
D
n
1
n
2
y Note:
1. Range of n
1
: 1~ 1,024
2. Range of n
2
: 1~ n
1
16-bit instruction (9 Steps)
SFTR
Continuous
execution
32-bit instruction
- - - -
y Flags: None
Operands:
S
: Start No. of the shifted device
D
: Start No. of the device to be shifted
n
1 : Length of data to be shifted
n
2 : Number of bits to be shifted in 1 shift
Explanations:
This instruction shifts the bit device of n
1
bits (desired length for shifted register) starting from D to the
right for n
2
bits. S is shifted into D for n
2
bits to supplement empty bits.
Program Example:
When X0 = Off→On, M0 ~M15 will form 16 bits and shifts to the right (4 bits as a group). The figure
below illustrates the right shift of the bits in one scan.
n M3 ~ M0 → carry
o M7 ~ M4 → M3 ~ M0
p M11 ~ M8 → M7 ~ M4
q M15 ~ M12 → M11 ~ M8
r X3 ~ X0 → M15 ~ M12 completed
X0
SFTR X0 M0 K16 K4
X3 X2 X1 X0
M15 M14 M13 M12 M11 M10 M9 M8 M7 M6 M5 M4 M3 M2 M1 M0
1 2 3 4
5
carry
4 bits as a group shifting to the right