List Of Buffer Memory Areas - Mitsubishi Electric MELSEC-Q Series User Manual

3.5

List of Buffer Memory Areas

Buffer memory is memory to transmit data between a master/local module and a CPU module.
Data can be read from or written to buffer memory areas by setting the parameters of a programming tool or using
dedicated instructions.
Resetting the CPU module or powering off and on the system returns data in buffer memory areas to default.
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
Address
Hexadecimal Decimal
0 to DF
0 to 223
H
224 to
E0 to 15F
H H
351
352 to
160 to 1DF
H H
479
480 to
1E0 to 2DF
H H
735
38
Name Description
Parameter
information Stores parameter settings.
area
(Master station)
Stores the status of the data
input from slave stations.
Remote input
(Local station)
*1
(RX)
Stores the status of the data
input from the master
station.
(Master station)
Stores the status of the data
output to slave stations.
(Local station)
Stores the status of the data
Remote output
output to the master station.
*1
(RY)
Stores the status of the data
output to slave stations.
Data received from other
slave stations are also
stored.
Remote register (Master station)
Stores the send data to
*1
(RWw)
slave stations.
• Master
station: For
(Local station)
data sending
Stores the send data to the
• Local station: master station and other
For data salve stations. Data
sending/ received from other slave
receiving
stations are also stored.
: Can be used, –: Cannot be used
Availability
Read/write
Master
station
(Not available
when a
Read only
standby master
station is
controlling the
system)
Read only
–
Write only
Read/
–
write
Write only
Read/
–
write
Reference
Local
station
Page 328,
– Appendix 2
(1)
–
Page 331,
Appendix 2
(2)
–
Page 331,
Appendix 2
(2)
–
Page 333,
Appendix 2
(3)