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MELSEC-Q
3 SPECIFICATIONS
3.4 Buffer Memory List
3.4.1 Buffer memory/configuration
The configuration of the buffer memory used to receive and send data with the
QJ71PB92D and the PLC CPU is described below.
Buffer memory address
decimal (Hexadecimal)
Area name
Description
0
959
(0
H
)
(3BF
H
)
Input area
This is the area that stores the input data from the slave.
960
1919
(3C0
H
)
(77F
H
)
Output area
This is the area that stores the output data to the slave.
1920
2039
(780
H
)
(7F7
H
)
Address information area
This is the area that shows the slave address and I/O data length.
2040
2079
(7F8
H
)
(81F
H
)
Communication trouble area
This is the area that shows the trouble information that occurred during
communication.
2080
(820
H
)
Slave error information cancel area
This is the area that sets the data that masks the slave trouble information.
2081
(821
H
)
Global control area
This is the global control function hold/cancel selection area.
2082
(822
H
)
Not usable
2083
(823
H
)
Time out time setting area (Closed to users
because this is a debugging function.)
This is used to set the time out time when an exchange start/stop is executed.
2084
(824
H
)
Trouble no information time setting area
This is used to set the time that does not inform the communication trouble
after the exchange start.
2085
2095
(825
H
)
(82F
H
)
Not usable
2096
2110
(830
H
)
(83E
H
)
Expansion communication trouble area
This area shows the expansion information of the trouble information which is
occurred during the communication.
2111
(83F
H
)
Not usable
2112
2116
(840
H
)
(844
H
)
Slave status area
This is the area that shows the status information of each slave.
2117
2127
(845
H
)
(84F
H
)
Not usable
2128
2247
(850
H
)
(8C7
H
)
Input/Output start address area (Extended
service mode only)
This is the area that shows the addresses to start the input area and output
area of each slave.
2248
2253
(8C8
H
)
(8CD
H
)
Not usable
2254
(8CE
H
)
Current operation mode area
This area indicates the operation mode of the QJ71PB92D when it has started
up.
2255
(8CF
H
)
Operation mode change request area
In this area, set the operation mode of the QJ71PB92D which you want to
choose.
2256
(8D0
H
)
Operation mode change result area
This area indicates the execution result of the operation mode change
request.
2557
(8D1
H
)
Local station address display area
Area in which the station address of the local station is stored.
2558
(8D2
H
)
Self-diagnosis status code area
Area in which the code indicating the status of the self-diagnosis during the
execution of the diagnosis is stored.
2259
3775
(8D3
H
)
(EBF
H
)
Not usable
POINT
Don't read and write to the buffer memory which is not usable.
If you perform it, it cannot guarantee as the QJ71PB92D function.
