Mitsubishi Electric M800VW Series Programming Manual page 308

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 DROL(P) or DRCL(P) instructions.
 Program example
 The following program rotates the contents of D0 and D1, not including the carry flag, 4 bits to the left when XC is ON.
M0
0
XC
4
8
Carry flag
(SM12)
b31 b28b27
0
1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0
Number of rotations
D11,D10
Carry flag
(SM12)
b31 b28b27
1
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
Contents of b28
prior to execution
 The following program rotates the contents of D0 and D1, including the carry flag, 4 bits to the left when XC is ON.
XC
0
4
Carry flag
(SM12)
b31 b28b27
1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0
*
Carry flag
(SM12)
b31 b28b27
1
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
Contents of b28
prior to execution
(*) The carry flag goes ON or OFF depending on its status prior to the execution of the DRCL instruction.
[Ladder mode]
DMOV K4 D10
DROL D0 D10
END
b24b23 b20b19 b16b15 b12b11
4
b24b23 b20b19 b16b15 b12b11
Contents of b27 to b0
prior to execution
[Ladder mode]
DRCLP D0 K4
END
b24b23 b20b19 b16b15
b24b23 b20b19 b16b15
Contents of b27 to b0
prior to execution
287
Steps
0
1
4
5
8
b8 b7 b4 b3 b0
D0,D1
b8 b7 b4 b3 b0
D0,D1
Contents of b31 to b28
prior to execution
Steps
0
1
4
b12b11 b8 b7 b4 b3
b12b11 b8 b7 b4 b3
Contents of b31 to b29
prior to execution
Contents of carry flag SM12
prior to execution
[List mode]
Inst. Device
LD M0
DMOV K4
D10
LD XC
DROL D0
D10
END
[List mode]
Inst. Device
LD XC
DRCLP D0
K4
END
b0
D0,D1
b0
D0,D1
IB-1501667-B