Exchanging Data Using The Buffer Memory Automatic Update Function; Transmitting Data To An External Device - Mitsubishi MELSEC AJ65BT-R2 User Manual

6 EXCHANGING DATA WITH AN EXTERNAL DEVICE

6.3 Exchanging data using the buffer memory automatic update function

6.3.1 Transmitting data to an external device

Programmable controller CPU
Bit device
2) Transmission
request ON
6) Transmission
request OFF
Word device
1) Transmission
data write
When using the buffer memory automatic update function, data is transmitted and
received via the master station automatic update buffer (transmission area) using the
FROM/TO command or CC-Link dedicated command RITO/RIFR.
To use the buffer memory automatic update function, set the mode setting switch to "1"
(buffer memory automatic update function enable), and initialize the automatic update
buffer (refer to section 5.5.1 for details).
POINT
(1) The address for the automatic update buffer differs for the A Series master
module and Q/QnA Series master module as follows.
Refer to section 5.2 for details on changing the banks.
• A Series master module
•
Q/QnA Series master module : M 2000
(2) When using the RITO/RIFR command, the bank is changed automatically, so it
does not need to be changed by the user.
The method for transmitting data to an external device using the buffer memory
automatic update function is explained in this section.
(1) Flow of process
The flow of the process for transmitting data to an external device using the
buffer memory automatic update function is shown below.
Master station
5) Transmission normal
Remote
7) Transmission normal
input (RX)
Remote
output (RY)
Automatic
update
3) Automatic read
buffer
(transmis-
sion area)
: Bank 2 M 0
R2
/error complete ON
Remote
input (RX)
/error complete OFF
Remote
output (RY)
Trans-
mission
area
6 - 9
MELSEC-A
to FFF
H H
to 2FFF
H H
Random area
RS-232-C
4) Data transmission
External
device
Trans-
mission