Appendix 3 Buffer Memory; List Of Buffer Memory Addresses - Mitsubishi Electric MELSEC iQ-R Series User Manual

Appendix 3
The buffer memory is used to exchange data between the master/local module and the CPU module.
Buffer memory values are reset to default when the CPU module is reset or the system is powered off.

List of buffer memory addresses

When a standby master station is used, refer to the respective columns under "Availability" in the table as explained below.
• When a standby master station is operating as a master station: "Master station" column
• When a standby master station is operating as a standby master station: "Local station" column
: Available, : Not available
Address
Hexadecimal Decimal
0H to DFH 0 to 223
E0H to 15FH 224 to 351
160H to 1DFH 352 to 479
1E0H to 2DFH 480 to 735
2E0H to 3DFH 736 to 991
3E0H to 5DFH 992 to 1503
5E0H to 5FFH 1504 to 1535
600H to 7FFH 1536 to 2047
800H to 9FFH 2048 to 2559
A00H to FFFH 2560 to 4095
1000H to 1FFFH 4096 to 8191
2000H to 2FFFH 8192 to 12287
Buffer Memory
Name Description
Parameter Stores parameter settings.
information
area
Remote input ■Master station
*2
(RX) Stores the data input from slave
stations.
■Local station
Stores the data input from the master
station.
■Master station
Remote
*2
output (RY)
Stores the data output to slave
stations.
■Local station
Stores the data output to the master
station. Data input from other slave
stations are also stored.
Remote ■Master station
register Stores the send data to slave
*2
(RWw) stations.
■Local station
Stores the send data to the master
station and other salve stations. Data
received from other slave stations are
also stored.
Remote ■Master station
register Stores the data received from slave
*2
(RWr) stations.
■Local station
Stores the data received from the
master station.
Slave station Stores the offset and size of RX, RY,
offset, size RWw, and RWr in each slave station.
information
(512 words)
Link special Stores the data link status.
relay (SB)
Link special Stores the data link status.
register (SW)
System area 
Random Stores any data and is used for
access buffer transient transmission.
System area 
Automatic Stores data automatically updated
update buffer when transient transmission
(communications using the automatic
update buffer) is performed with an
intelligent device station.
Read/ Availability
write
Master Local
station station
*1
 
Read
 
Read
 
 
Read, write
 
Read, write  
 
Read  
 
Read  
 
Read, write
(Data can be
written only
to areas with
the first 32
addresses.)
  
 
Read, write
  
 
Read, write

Appendix 3 Buffer Memory

Reference
Page 139 Parameter
information area
Page 142 Remote
input (RX)
Page 142 Remote
input (RX)
Page 143 Remote
output (RY)
Page 143 Remote
output (RY)
A
Page 145 Remote
register (RWw)
Page 145 Remote
register (RWw)
Page 144 Remote
register (RWr)
Page 145 Remote
register (RWw)
Page 146 Slave
station offset, size
information
Page 148 Link
special relay (SB)
Page 148 Link
special register (SW)

Page 148 Random
access buffer

Page 149 Automatic
update buffer
APPX
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