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Bit-shift instructions
F121_ROL
Rotates n bits of the 16-bit data specified by d to the left if the trigger EN is in the ON-state.
Description
The following example rotates one bit to the left:
Bit position
D
Bit position
D
Special internal relay
R9009 (carry flag)
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.
Availability of F121_ROL (see page 1320)
PLC types
Data types
Variable
Data type
ANY16
d
INT
n
Operands
For
d
n
588
16-bit data left rotate
15
12 11
8 7
4 3
· · ·
· ·
· ·
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
15
12 11
8 7
4 3
· · ·
· ·
· ·
1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Data in bit position 15
0
Function
16-bit area
number of bits to be rotated
Relay
-
WY
WR
WL
WX
WY
WR
WL
0
· ·
0
· ·
0
T/C
Register
SV
EV
DT
LD
FL
SV
EV
DT
LD
FL
Constant
-
dec. or hex.
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