Mitsubishi Electronics FX3G User Manual

FX

3S

/FX

3G

/FX

3GC

/FX

3U

/FX

3UC

 Series

Programming Manual - Basic & Applied Instruction Edition

11 Rotation and Shift Operation – FNC 30 to FNC 39

→ For a program example of FILO, refer to Section 27.3.

In the example below, the shift write (SFWR) and shift read (SFRD) instructions are used.
1) Contents of operation

- In this circuit example, a product number to be taken out now is output according to "first-in first-out" rule while 

products which were put into a warehouse with their product numbers registered are taken out of the warehouse. 

- The product number is hexadecimal, and up to 4 digits. Up to 99 products can be stored in the warehouse.

2) Program

X020

FNC 12

MOVP

K4X000

D256

FNC 38

SFWRP

D256

D257

K100

X021

FNC 39

SFRDP

D257

D357

K100

FNC 12

MOV

D357

K4Y000

M8000

RUN

monitor

Button for request to take a

product out of warehouse

Button for request to put a

product into warehouse

The product number is input from X000 to X017, and

transferred to D256.

Pointer

D257: Data register for storing the product number

D258 to D356 (99 points)

The product number of a product put into first is output

to D357 in response to the request to put a product out

of the warehouse.

The product number to be taken out is output to Y000

to Y017 in a four-digit hexadecimal number.

1234

D256

MOV instruction

0320

0

0232
0462
0539
0142

0

0

D258
D259
D260
D261
D262
D263

D355
D356

0

5

D257

0

0

4

0

Shift

0232
0462
0539
0142

0
0

+1

SFRDP instruction

is executed.

SFWRP instruction

is executed.

−1

0320

D357

0

0

0320

0

0232
0462
0539
0142
1234

6

100

99

1

7

2
3
4
5
6

MOV instruction

1

2

3

4

Request to

put a

product into

warehouse

Request to

take a

product out

of warehouse

X20

X21

Digital switch 0000 to FFFF

Seven-segment display unit

Y017 to Y000

X017 to X000

Command

Command