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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
11 Rotation and Shift Operation – FNC 30 to FNC 39
11.4 FNC 33 – RCL / Rotation Left with Carry
2. 32-bit operation (DRCL and DRCLP)
"n" bits out of 32 bits of [ +1, ] and 1 bit (carry flag M8022) are rotated leftward.
Related device
→ For the carry flag use method, refer to Subsection 6.5.2.
Cautions
• In the case of continuous operation type instructions (RCL and DRCL)
Note that shift and rotation are executed in every scan time (operation cycle).
• When a device with digit specification is specified as
Only K4 (16-bit instruction) or K8 (32-bit instruction) is valid (examples: K4Y010 or K8M0).
• Note that the 32-bit value [n+1, n] is valid when D or R is specified as "n" in a 32-bit instruction.
In the case of "DRCL D100 R0", "n" is [R1, R0].
Device Name Description
M8022 Carry Turns ON when the bit shifted last from the highest position is "1".
D
D
Command
input
FNC 33
DRCLP
nD
Carry flag
When M8022
is ON
1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1
0
Low order
b15b14b13b12b11b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
After the
instruction is
executed once
High order
1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1
b31b30b29b28b27b26b25b24b23b22b21b20b19b18b17b16
Before shift b27 to b0
High order
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
Low order
1
Leftward
rotation
b15b14b13b12b11b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
1 1 1 0 1 1 1 1 0 0 0 0 0 0 0 0
b31b30b29b28b27b26b25b24b23b22b21b20b19b18b17b16
Before shift
b31 to b29
b31 to b29 (32
−
n+1) and the head
bit indicating the carry flag ON/OFF
status are moved.
The status
of the final
bit b28 (bit
"32
−
n") is
stored.
"n" bits (in the case of K4)
b31 to b28
(b32
−
n)
are
moved.
Before shift
Carry flag M8022
Carry flag M8022
Before shift b28
Before
execution
After
execution
D