Mitsubishi Electronics FX3G User Manual

302

/FX

3GC

/FX

3UC

Series

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 from OFF to ON in the 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 FX

/FX

3UC

PLCs, an operation error occurs

(error code: K6710).
An operation error does not occur in FX

/FX

3GC

PLCs.

Command

input

FNC 34
SFTRP

Before

execution

After

execution

n2 (in the case of "n2=3")

n1 (in the case of "n1=9")

[1]

Overflow (data to

be deleted)

+6 +5 +4 +3

+7 +6 +5

[3] Copy

[2]

"n2" bits are

shifted rightward

(n2=3).

+2 to before shift (n2=3)

+8 to +3 before shift (n2=3)