Chapter 14 PLC Function
|
C200 Series
14-54
API
31
ROL
P
D
n
Rotate to the Left
Bit Devices
Word Devices
X Y M K H KnX
KnY
KnM T
C
D
D
*
*
*
*
*
n
*
*
Operands:
D: if in KnY and KnM, only K4 (16-bit) is valid
n: n=K1~K16 (16-bit)
16-bit command (5 STEPS)
ROL
ROLP
32-bit command
-
-
-
-
Flag signal: M1022 Carry flag
Explanation
1.
D
: Device to be rotated;
n
: Number of bits to be rotated in 1 rotation
2. This instruction rotates the device content designated by
D
to the left for
n
bits.
3. This instruction adopts pulse execution instructions (ROLP).
Example
When X0 goes from Off to On, the 16-bit (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
upper bit
upper bit
lower bit
lower bit
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