Mitsubishi MELSEC-A Series Programming Manual page 264

7. APPLICATION INSTRUCTIONS
Program Examples FIFW
Program which uses D38 to 47 as a FIFO table and temporarily stores the data of
X20 to 2F when XB turns on. When the data exceeds 9, this program turns on Y60 to
disable the execution of FIFW instruction.
(The data storage location is as shown below when the pointer value is 5.)
K
>
D38 8
0
X00B Y060
6
FIFW
• Coding
0 LD> D38 K8
5 OUT Y060
6 LD X00B
7 ANI Y060
8 FIFWP K4X020 D38
15 END
Pointer
When pointer (D38) is 9 or more,
)
( Y060
Y60 is turned on.
P K4
Data of X20 to 2F is stored into
X020 D38
FIFO table.
Before execution
7 − 62
MELSEC-A
After execution