274
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
11 Rotation and Shift Operation – FNC 30 to FNC 39
11.3 FNC 32 – RCR / Rotation Right with Carry
2. 32-bit operation (DRCR and DRCRP)
"n" bits out of 32 bits of [
+1,
] and 1 bit (carry flag M8022) are rotated rightward.
Related device
→
For the carry flag use method, refer to Subsection 6.5.2.
Cautions
1. In the case of continuous operation type instructions (ROR and DROR)
Note that shift and rotation are executed in every scan time (operation cycle).
2. 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).
Device
Name
Description
M8022
Carry
Turns ON when the bit shifted last from the lowest position is "1".
D
D
Before shift
b3
Carry flag M8022
When M8022 is OFF
0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0
1
Carry flag M8022
Low order
b15b14b13b12b11b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
After the
instruction is
executed once
High order
0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0
b31b30b29b28b27b26b25b24b23b22b21b20b19b18b17b16
Before shift b31 to b4
High order
1 1 1 1 1 1 1 1 0 0 0 0
1
0 0 0
Low order
Rightward
rotation
b15b14b13b12b11b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
b31b30b29b28b27b26b25b24b23b22b21b20b19b18b17b16
The status
of the final
bit b3 (bit
"n
−
1") is
stored.
"n" bits (in the case of K4)
"n" bits
0
Before shift
Carry flag M8022
Before
shift
b2 to b0
b2 (n
−
2) to b0 and the head bit
indicating the carry flag ON/OFF
status are moved.
Before
execution
After
execution
Command
input
FNC 32
DRCRP
n
D
D