Mitsubishi Electric M800VW Series Programming Manual page 304

M800V/M80V Series PLC Programming Manual (1/2)
8 Function Instructions
8.7 Rotation Instructions
 Operation errors
 There are no arithmetic errors associated with the ROL(P) or RCL(P) instructions.
 Program example
 The following program rotates the contents of D0, not including the carry flag, 3 bits to the left when XC is ON.
XC
0
4
Carry flag
(SM12)
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
1
0
Carry flag
(SM12)
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
1
1
Contents of b13
prior to execution
Contents of b12
prior to execution
 The following program rotates the contents of D0, including the carry flag, 3 bits to the left when XC is ON.
XC
0
4
Carry flag
(SM12)
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
* 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0
Carry flag
(SM12)
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
1 1 0 0 0 0 0 0 0 0 0 0 0 0 *
Contents of b13
prior to execution
Contents of b12
prior to execution
(*) The carry flag goes ON or OFF depending on its status prior to the execution of RCL instruction.
[Ladder mode]
ROL D0 K3
END
1 1 1 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
Contents of b11 to b0
prior to execution
[Ladder mode]
RCLP D0 K3
END
Contents of b11 to b0
prior to execution
Steps
0
1
4
0 0 0 0 0 0 D0
0 0 0 1 1 1 D0
Contents of b15 to b13
prior to execution
Steps
0
1
4
D0
1 1 D0
Contents of b15 and
b14 prior to execution
Content of carry flag SM12
283
[List mode]
Inst. Device
LD XC
ROL D0
K3
END
[List mode]
Inst. Device
LD XC
RCLP D0
K3
END
IB-1501667-B