Mitsubishi Electric MELSEC FX3U Programming Manual page 310

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2. 32-bit operation (DROR and DRORP)
"n" bits out of 32 bits of [
Command
input
FNC 30
DRORP
• The final bit is stored in the carry flag (M8022).
• In a device with digit specification, K8 (32-bit instruction) is valid.
High order
b31b30b29b28b27b26b25b24b23b22b21b20b19b18b17b16
Before
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
execution
"n" bits
High order
b31b30b29b28b27b26b25b24b23b22b21b20b19b18b17b16
After
0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0
execution
Before shift
b3 to b0
Related device
Device
M8022
Cautions
• In the case of continuous operation type instructions (ROR and DROR)
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 "DROR D100 R0", "n" is [R1, R0].
308
+1, ] are rotated rightward.
D D
D n
Rightward
rotation
Name
Carry Turns ON when the bit shifted last from the lowest position is "1".
11 Rotation and Shift Operation – FNC 30 to FNC 39
b15b14b13b12b11b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
1 1 1 1 1 1 1 1 0 0 0 0
After the The status of
instruction is the bit "n−1" is
executed once copied.
b15b14b13b12b11b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0
Before shift
b31 to b4
→ For the carry flag use method, refer to Subsection 6.5.2.
Description
D
11.1 FNC 30 – ROR / Rotation Right
"n" bits (in the case of K4)
Low order
Carry flag
M8022
0 0 0 0
b0 to b3 (n−1)
are moved.
The status of the bit "n−1" is
Low order
0
Carry flag
M8022
The contents of
b3 are stored.
copied.