Assignment And Modes; Assignment - Mitsubishi Electric MELSEC-Q Series User Manual

3.6

Assignment and Modes

For a master/local module, the mode can be selected according to the system used. For example, there is a mode to
configure a new system or a mode to add a Ver.2-compatible slave station to a Ver.1-compatible slave station.
Depending on the mode, the addresses of buffer memory areas to store RX, RY, RWr, and RWw vary.
3.6.1

Assignment

In CC-Link, communications are performed between the master station and slave stations using RX, RY, RWr, and
RWw. Data in RX, RY, RWr, and RWw of the master/local module are stored in the buffer memory.
This section describes the assignment using an example of data input and output of the master station and local
station.
CPU
module
Station No.0
Device
RX, RWr
RY, RWw
Range of the
master station
sending data to
the station No.1
Range of the
master station
sending data to
the station No.2
Range of the
master station
sending data to
the station No.3
*1 RWr and RWw are not used for a remote I/O station. Note, however, that buffer memory areas are occupied depending
on the mode of the master/local module. (
● Buffer memory (RX, RY, RWr, and RWw) addresses differ depending on the mode of the master/local module.
( Page 46, Section 3.6.3 to Page 55, Section 3.6.6)
● In a local station, data in RX and RWr of other slave stations are stored into RY and RWw, and data in RY and RWw of
other stations are stored into RX and RWr. (Areas where data is input and output are reversed.)
Master Remote device station
station
Intelligent device station
Station No.1
Buffer
memory
RX, RWr
Station
Range of the
station No.1
No.1
sending data
Station
No.2
Station
No.3
RY, RWw
Station
No.1
*1
Remote I/O station
Station No.2
RX, RWr
Range of the
station No.2
sending data
RY, RWw
Station
No.2
Data sent from the master station
Data sent from slave stations
Page 46, Section 3.6.3 to Page 55, Section 3.6.6)
CHAPTER 3 SPECIFICATIONS
CPU
Local station
module
Station No.3
Buffer
Device
memory
RX, RWr
Station
No.1
Station
No.2
Station
No.3
RY, RWw
Station
No.1
Station
No.2
Range of the
station No.3
sending data
Area where data is sent to other
stations
3
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