Delta Electronics Extension Digital I/O Module DOP-EXIO14RAE - Manual (Page 129)

Appendix D Use of Application Instructions|DOP-EXIO Series
D-48 Revision March, 2008, Doc. Name: 2007PDD23000014
Mnemonic Operands Function
ROL D D n Rotation Left
Bit Devices Word Devices
X Y M S K H KnX KnY KnM KnS T C D E F
D
n
y Note:
1. If D is used in device F, only 16-bit instruction is applicable.
2. If D is designated as KnY, KnM, and KnS, only K4 (16-bit) and K8
(32-bit) are valid.
3. Range of n: 1 ~ 16 (16-bit); 1 ~ 32 (32-bit)
16-bit instruction (5 Steps)
ROL
Continuous
execution
32-bit instruction (9 Steps)
DROL
Continuous
execution
y Flags: M1022 (Carry flag)
Operands:
D
: Device to be rotated
n
: Number of bits to be rotated in 1 rotation
Explanations:
This instruction rotates the device content designated by D to the left for n bits.
Program Example:
When X0 = Off→On, the 16 bits (4 bits as a group) in D10 will rotate to the left, as shown in the figure
below. The bit marked with ※ will be sent to carry flag M1022.
X0
D10 K4
1 1 1 1 1 1 0 0 0 0 0 1 1 0 0 0
1 1 0 0 0 0 0 1 1 0 0 1 1 0 1 1 1
16 bits
Rotate to the left
After one rotation
to the left
Carry
flag
Carry
flag
D10
D10
lower bit
lower bit
higher bit
higher bit