Buffer Memory List - Mitsubishi A1SJ61BT11 User Manual

3 SPECIFICATION
3.5 Buffer Memory

3.5.1 Buffer memory list

Address
Hex. Dec.
0 to 5F 0 to 95
H H
60 to 7F 96 to 127
H H
80 to CD 128 to 205
H H
CE to DF 206 to 223
H H
E0 to 15F 224 to 351
H H
160 to 1DF 352 to 479
H H
1E0 to 2DF 480 to 735
H H
2E0 to 3DF 736 to 991
H H
3E0 to 5DF 992 to 1503
H H
5E0 to 5FF 1504 to 1535 Link special relay (SB) Stores the data-link status.
H H
600 to 7FF 1536 to 2047
H H
800 to 9FF 2048 to 2559
H H
A00 to FFF 2560 to 4095 Random access buffer
H H
Do not write to areas that are prohibited to use. An error may occur.
The buffer memory is used to swap data between the master/local module and the PC
CPU.
In the PC CPU, the FROM/TO instructions are used to read/write data.
The contents of the buffer memory return to the default values when the power is
turned off and the PC CPU is reset.
The buffer memory list is shown in Table 3.4.
Table 3.4 (1) Buffer memory list (bank 0)
Item
Parameter information Stores the information (parameters) to
area execute the data link.
(Prohibited to use)
Parameter information Stores the information (parameters) to
area execute the data link.
(Prohibited to use)
When master station: Stores the input
status from the remote/local station.
Remote input (RX)
When local station: stores the input status
from the master station.
When master station: Stores the output
status of the output to the remote/local
station.
Remote output (RY)
When local station: Stores the output status
of the output to the master station.
When master station: Stores the
transmission data to the remote/all local
Remote register (RWw)
stations.
(Master station: for
sending
When local station: Stores the transmission
Local station: for
data to the master/other local stations.
sending/receiving)
Also, stores the received data from the
remote/other local stations.
Remote register (RWr)
When master station: Stores the received
(Master station: for
data from the remote/local station.
receiving
When local station: Stores the received
Local station: for
data from the master station.
receiving)
(Prohibited to use)
Link special register
Stores the data-link status.
(SW)
(Prohibited to use)
Uses for dedicated instruction of RIRD,
RIWT, etc.
Details
–
–
–
–
3 - 18
MELSEC-A
Availability
Read/write
Master Local
possibility
station station
Read/write
enabled
– – –
Read/write
enabled
– – –
–
Read only
Write only –
Read/write
–
enabled
Write only –
Read/write
–
enabled
–
Write only
–
– – –
Read/write
enabled
(write
disabled
depending
on the
device)
– – –
Read/write
enabled
: Usable : Prohibited to use
Reference
Section
3.5.2 (1)
–
Section
15.2.1
–
Section
3.5.2 (2)
Section
3.5.2 (3)
–
Section
3.5.2 (4)
Section
3.5.2 (5)
–
Section
15.6