Mitsubishi FX3U-16CCL-M User Manual

10 Buffer Memory
10.1 How to read/write from/to buffer memory
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FX3U-16CCL-M User's Manual
10. Buffer Memory
10.1 How to read/write from/to buffer memory
To read/write from/to buffer memory in the FX3U-16CCL-M, use the FROM/TO instructions or applied
instructions that directly specify the buffer memory.
For other methods, refer to the Programming Manual.
10.1.1 FROM/TO instructions
1. FROM instruction (Reading out BFM data to PLC)
Use the FROM instruction to read the data from the buffer memory.
If the following program is created, 1 point of data will be read out from the buffer memory BFM #29 of unit
No.1 to data register D10.
2. TO instruction (Writing PLC data into BFM)
Use the TO instruction to write data to a buffer memory.
If the following program is created, 1 point of data (H0001) will be written to buffer memory BFM #0 of unit
No.1.
10.1.2 Direct specification of buffer memory
When directly specifying the buffer memory, specify the following device in the source or destination area of
the applied instruction as follows:
1. Reading out BFM data to PLC (MOV instruction)
If the following program is created, 1 point of data will be read out from the buffer memory BFM #29 of unit
No.1 to data register D10.
2. Writing PLC data into BFM (MOV instruction)
If the following program is created, 1 point of data (H0001) will be written to buffer memory BFM #0 of unit
No.1.
READ command
FNC 78
FROM
K1 K29 D10 K1
Destination register
Number of transfer data points
Unit No.
Buffer memory No.
WRITE command
FNC 79
TO
K1 K0 H0001 K1
Transfer source
Number of transfer data points
Unit No.
Buffer memory No.
Unit No. (0 to 7) Buffer memory No. (0 to 32766)
U \G
is substituted with a numbe
r
READ command
FNC 12
MOV
U1\G29 D10
Transfer result
Unit No.
Buffer memory No.
WRITE command
FNC 12
MOV
H0001 U1\G0
Transfer source
Unit No.
Buffer memory No.

Mitsubishi FX3U-16CCL-M Specifications

General

Brand	Mitsubishi
Model	FX3U-16CCL-M
Category	Controller
Language	English