Buffer Memory; Buffer Memory List - Mitsubishi QJ71DN91 User Manual

3 SPECIFICATIONS

3.4 Buffer Memory

3.4.1 Buffer memory list

Address
Hexadecimal Decimal
0000 to
H
256 to 271
010F
H
0110 to
H
272 to 287
011F
H
0120 to
H
288 to 303
012F
H
0130 to
H
304 to 423
01A7
H
01A8 to
H
424 to 431
01AF
H
01B0 432
H
01B1 433
H
01B2 434
H
01B3 435
H
01B4 to
H
436 to 439
01B7
H
01B8 to
H
440 to 443
01BB
H
01BC to
H
444 to 447
01BF
H
01C0 to
H
448 to 451
01C3
H
01C4 to
H
452 to 455
01C7
H
01C8 to
H
456 to 459
01CB
H
01CC to
H
460 to 463
01CF
H
01D0 to
H
464 to 467
01D3
H
01D4 to
H
468 to 975
03CF
H
03D0 to
H
976 to 1007
03EF
H
03F0 1008
H
03F1 to
H
1009 to 1279 Use prohibited
04FF
H
0500 to
H
1280 to 1531
05FB
H
3 - 24
The buffer memory transfers data between the QJ71DN91 and the PLC CPU.
The FROM and TO instructions of the PLC CPU are used to read and write the buffer
memory data in the QJ71DN91.
The contents of the buffer memory are reset to 0 when the power is turned OFF or
when the PLC CPU is reset.
However, the "parameter" area is initialized using the saved parameters if the
parameters have been saved in the flash ROM.
The buffer memory list is shown in Table 3.3.
Table 3.3 Buffer memory list (1/2)
Item
Use prohibited
Message communication Stores the request data for executing
command the message communication.
Message communication Stores the result data of the message
result communication.
Message communication Stores the transmission and reception
data data of the message communication.
Use prohibited
Master Function Stores the communication status of
Communication Status the master function.
Higher byte: Error code
Master Function For Error
Lower byte: Stores the node number
Information
Stores the number of times errors are
Bus Error Counter
detected in the communication data.
Stores the number of communication
Bus Off Counter
errors.
Each Node Configuration Indicates whether or not each slave
Status node is set with a parameter.
Use prohibited
Each Node Indicates whether or not each node is
Communication Status executing I/O communication.
Use prohibited
Each Node Obstacle Indicates whether or not each node
Status has a trouble.
Use prohibited
Sets whether or not the "slave down"
Down Node Detection
signal (X04) reflects the down status
Disable Status
of each slave node.
Use prohibited
Area for setting parameters for the
Parameters for the master
master function by the sequence
function
program.
Use prohibited
Auto configuration Sets up the operation of the auto
operation setting configuration.
Master Function For I/O Displays the address and size of each
Address Area I/O data for the master function.
Description
Master
function
—
—
where the error occurred.
—
—
—
—
—
—
MELSEC-Q
Usability
Write from the
Slave
CPU allowed?
function
— — —
— Yes
— No
— Yes
— — —
— No
— No
— No
— No
— No
— — —
— No
— — —
— No
— — —
— No
— — —
— Yes
— — —
— Yes
— — —
— No
Reference
section
—
3.4.2 (1)
3.4.2 (2)
3.4.2 (3)
—
3.4.2 (4)
3.4.2 (5)
3.4.2 (6)
3.4.2 (7)
3.4.2 (8)
—
3.4.2 (9)
—
3.4.2 (10)
—
3.4.2 (11)
—
3.4.2 (12)
—
3.4.2 (13)
—
3.4.2 (14)
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