Mitsubishi MELSEC AJ65BT-R2 User Manual page 110

6 EXCHANGING DATA WITH AN EXTERNAL DEVICE
(2) Reception area
When data is transmitted from the external device to the R2, the data is stored in
the R2 reception area.
This reception area is the R2 buffer memory area where the reception data size
and reception data is stored for the programmable controller CPU to read the
data received from the external device.
The reception area size can be set by setting the R 2 2
memory.
Refer to section (4) for details.
(a) Reception area configuration
The reception area stores the received data size in the head word, and
stores the received data in the second and following words.
Address Buffer memory
Reception data size
R2 400
storage area
H
R2 401
H
Reception data
storage area
R2 5FF
H
(At default)
POINT
The data amount transmitted in one session from the external device to the R2
must be set to be smaller than the R2 reception data storage area size.
(Reception data storage area) ≥ (Amount of data received from external device)
Thus, if an amount of data that cannot be stored in the default reception area is to
be received, increase the reception area.
The reception data size unit (word/byte) follows
the value set in the buffer memory word/byte unit
designation area (
The reception data storage size for when reading of the
received data to the programmable controller CPU is
requested is written in.
A random data section of the received data is stored.
6 - 6
MELSEC-A
, R 2 3 buffer
H H
).
R2 102
H