Bit-shift instructions
588
Part III FP Instructions
F121_ROL
16-bit data left rotate
The following example rotates one bit to the left:
·········
D
15 12 11 8 7 4 3 0
·········
D
15 12 11 8 7 4 3 0
0
0101 01010101 0101
010101010101 0101
Bit position
Bit position
Special internal relay
R9009 (carry flag)
Data in bit position 15
When n bits are rotated to the left,
the data in bit position 16-n (nth bit starting from bit position 15) is transferred to special internal
relay R9009 (carry-flag).
n bits starting from bit position 15 are shifted out to the left and into the lower bit positions of the
16-bit data specified by d.
This instruction also exists as a P instruction (for FP2/2SH, FP3/5, FP10/10SH PLC types), which
is only executed at the rising edge of the EN trigger. Select [Insert P instruction] from the
"Instructions" pane if you require a P instruction. To facilitate reuse, the instruction then appears
under "Recently used" in the pop-up menu. Press <Ctrl>+<Shift>+<v> within the programming
area to open the list of recently used elements.
PLC types
Availability of F121_ROL (see page 1320)
Variable Data type Function
d ANY16 16-bit area
n INT number of bits to be rotated
For Relay T/C Register Constant
d - WY WR WL SV EV DT LD FL -
n WX WY WR WL SV EV DT LD FL dec. or hex.
Description
Rotates n bits of the 16-bit data specified by d to the left if the trigger EN is in the ON-state.
Data types
Operands
To Next Page
Loading...
