Mitsubishi Electric MELSEC FX3U Programming Manual page 312

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2. 32-bit operation (DROL and DROLP)
"n" bits out of 32 bits of [
Command
input
FNC 31
DROLP
• The final bit is stored in the carry flag (M8022).
• In a device with digit specification, K8 (32-bit instruction) is valid.
Carry
flag
Before
M8022
execution
The status of
the bit "32−n"
is copied.
After
execution
1
Carry
flag
M8022
The contents of
b28 are stored.
Related device
Device
M8022
Cautions
• In the case of continuous operation type instructions (ROL and DROL)
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 "DROL D100 R0", "n" is [R1, R0].
310
+1, ] are rotated leftward.
D D
D n
"n" bits (in the case of K4)
High order
b31b30b29b28b27b26b25b24b23b22b21b20b19b18b17b16
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
"16−n" bits
High order
b31b30b29b28b27b26b25b24b23b22b21b20b19b18b17b16
1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1
Name
Carry Turns ON when the bit shifted last from the highest 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 0 0 0 0
After the
instruction is
executed once
Leftward
rotation
b15b14b13b12b11b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
1 1 1 1 0 0 0 0 0 0 0 0 1 1 1
Before shift
b27 to b0
→ For the carry flag use method, refer to Subsection 6.5.2.
Description
D
11.2 FNC 31 – ROL / Rotation Left
Low order
b28 (32−n) to b31 are moved.
"n" bits
Low order
Before shift
b31 to b28
1