Mitsubishi QD51-R24

3 - 21 3 - 21
MELSEC-Q
3 SPECIFICATIONS
(b) In the QD51 (-R24), reading of data from, or writing of data to buffer
memory is done using the GETMEM/PUTMEM command in the BASIC
program.
Programmable
controller
CPU
TO
(Writing of data)
FROM
(Reading of data)
Buffer
Memory
BASIC
program
QD51(-R24)
GETMEM
(Reading of data)
PUTMEM
(Writing of data)
Program example
The following shows a program where data from A%(0) to A%(9)
(equivalent to 20 bytes) are written into the buffer memory area
addressed 0
H
to 13
H
using the PUTMEM command.
100 PUTMEM TO 0, 0 FROM A%(), 0, 20
Buffer Memory
0
H
1
H
2
H
13H
11H
10
H
3
H
12
H
0H
1
H
9
H
8
H
PUTMEM
(Writing of data)
BASIC
Program
(1-byte units)
QD51(-R24)
to
to
(2) Buffer Memory Capacity
The capacity of the QD51 (-R24)'s buffer memory is 3 k words (6 k bytes).
(3) Buffer Memory Configuration
One address of the buffer memory is composed by 16 bits.
The entire area can be used as desired by the user.
REMARK
Refer to the Programming Manual (Commands) concerning the GETMEM and
PUTMEM commands.