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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
11.5 FNC 34 – SFTR / Bit Shift Right
Explanation of function and operation
1. 16-bit operation (SFTR and SFTRP)
For "n1" bits (shift register length) starting from , "n2" bits are shifted rightward ([1] and [2] shown below).
After shift, "n2" bits from are transferred to "n2" bits from +n1-n2 ([3] shown below).
Caution
Note that "n2" bits are shifted every time the command input turns ON from OFF in SFTRP instruction, but that "n2"
bits are shifted in each scan time (operation cycle) in SFTR instruction.
Error
If the transfer source is equivalent to the shifted device in FX3U/FX3UC PLCs, an operation error occurs
(error code: K6710).
An operation error does not occur in FX
3G PLCs.
D
S
D
Command
input
FNC 34
SFTRP
n1 n2D
S
+2 +8
Before
execution
After
execution
+2
n2 (in the case of "n2=3")
n1 (in the case of "n1=9")
[1]
Overflow (data to
be deleted)
S
+1
+7
D
+6 +5 +4 +3
D
+1
+8
D
+7 +6 +5
D
+4
D
+3
D
+2
D
+1
D
D
[3] Copy
[2]
"n2" bits are
shifted rightward
(n2=3).
+2 to before shift (n2=3)
S
S
D
D
D
D
D
D
D
D
D
+8 to +3 before shift (n2=3)
D
D
S
S
S
D