Mitsubishi Electric M800VW Series Programming Manual page 302

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 ROR(P) or RCR(P) instructions.
 Program example
 The following program rotates the contents of D0, though not including the carry flag, 3 bits to the right when XC is ON.
XC
0
4
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
D0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
D0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1
Contents of b2 through Contents of b15 through
b0 prior to execution b4 prior to execution
 The following program rotates the contents of D0, including the carry flag, 3 bits to the right when XC is ON.
XC
0
4
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
D0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
D0 1 1 * 0 0 0 0 0 0 0 0 0 0 0 0 1
Contents of b1 and b0
prior to execution
Contents of carry flag SM12
(*) The carry flag goes ON or OFF depending on its status prior to the execution of RCR.
[Ladder mode]
ROR D0 K3
END
Carry flag
(SM12)
Carry flag
(SM12)
Contents of b2
prior to execution
Contents of b3
prior to execution
[Ladder mode]
RCRP D0 K3
END
Contents of b15 through
b4 prior to execution
Contents of b3
prior to execution
281
Steps
0
1
4
0
1
Steps
0
1
4
Carry flag
(SM12)
*
Carry flag
(SM12)
1
Contents of b2
prior to execution
[List mode]
Inst. Device
LD XC
ROR D0
K3
END
[List mode]
Inst. Device
LD XC
RCRP D0
K3
END
IB-1501667-B