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3 SPECIFICATION
MELSEC-QnA
Table 3.4 Buffer memory list (2/2)
Address Availability
Hex. Dec.
Item Details
Read/write
possibility
Master station
Local
station
Reference
When master station: Stores the
received data from the remote/local
station.
–
2E0H
to
3DF
H
736 to
991
Remote register (RWr)
(Master station:
for receiving
Local station:
for receiving)
When local station: Stores the
received data from the master
station.
Read only
Section
3.5.2 (3)
3E0H
to
5DF
H
992 to
1503
(Prohibited to use)
– – – – –
5E0H
to
5FF
H
1504
to
1535
Link special relay (SB) Stores the data-link status.
Section
3.5.2 (4)
600H
to
7FF
H
1536
to
2047
Link special register
(SW)
Stores the data-link status.
Read/write
enabled
(write
disabled
depending
on the
device)
Section
3.5.2 (5)
800H
to
9FF
H
2048
to
2559
(Prohibited to use)
– – – – –
A00H
to
FFF
H
2560
to
4095
Random access buffer
Uses for dedicated instruction of
RIRD, RIWT, etc.
Read/write
enabled
Section
15.6
1000H
to
1FFF
H
4096
to
8191
Transmission and
receiving buffer
Stores the transmission and received
data and the control data when a
transient transmission
(communication using the
transmission and receiving buffer) is
made with the intelligent device
stations.
The area for each intelligent device
station is set with the network
parameters.
Read/write
enabled
Section
15.2.1
2000H
to
2FFF
H
8192
to
12287
Automatic updating
buffer
Stores the automatic updating data
when a transient transmission
(communication using the automatic
updating buffer) is made with the
intelligent device stations.
The area for each intelligent device
station is set with the network
parameters.
Read/write
enabled
–
Section
15.2.1
: Usable : Prohibited to use
Do not write to areas that are prohibited to use. An error may occur.