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
111 11 100 0 0011 000
11000001100110111
16 bits
Rotate to the left
fter one rotation
to the left
Carry
flag
Carry
flag
D10
D10
upper bit
upper bit
lower bit
lower bit
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