7. APPLICATION INSTRUCTIONS
7 − 25
MELSEC-A
7.2.2 16-bit data left rotation
(ROL, ROLR, RCL, RCLP)
Available Device
Bit device Word (16-bit) device Constant Pointer
Level
Carry
flag
Error
flag
X Y M L S B F T C D W R A0 A1 Z V K H P I N
Digit specification
Index
M9012 (M9010, M9011)
n O O O O
Functions ROL
Rotates the data of A0 "n" bits to the left, without including the carry flag.
• The carry flag is 1 or 0 depending on the status prior to the execution of ROL.
RCL
Rotates the data of A0 "0" bits to the left, including the carry flag.
• The carry flag is 1 or 0 depending on the status prior to the execution of RCL.
Execution Conditions
Applicable
CPU
All CPUs
Left rotation commands
n
n
ROL, RCL
❏ Indicates the instruction symbol.
n Number of times (0 to 15)
Setting data
P
Carry flag
M9012
n bit rotation
Carry flag
(M9012)
n bit rotation
OFF
Executed
per scan
Executed
per scan
Executed
only once
Executed
only once
Left rotation command
P
ON
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