Table of Contents
Advertisement
5
FUNCTIONS
5 - 7
(4) Automatic communication function buffer areas
(a) Automatic communication function buffer areas
The automatic communication function uses the following buffer memory
areas.
Name
Automatic communication function
buffer input area
Automatic communication function
buffer output area
(b) Transfer direction of automatic communication function buffer
input/output area
The following shows the transfer directions of data stored into the buffer
memory by the automatic communication function.
1) Transfer direction in automatic communication function
buffer input area
When receiving a response message from the slave, the QJ71MT91
writes data to the automatic communication function buffer input area
in descending order of the addresses in 1 word (16 bits) unit.
2) Transfer direction in automatic communication function
buffer output area
When sending a request message to the slave, the QJ71MT91 creates
it by reading data from the automatic communication function buffer
output area in descending order of the addresses in 1 word (16 bits)
unit.
Application
Stores data read from the
slave
Stores data to be written
to the slave
MELSEC-Q
Buffer Memory Address
1000
to 1FFF
H
H
3000
to 3FFF
H
H
5 - 7
Advertisement
Table of Contents
