Buffer Memory; Buffer Memory Assignment - Mitsubishi MELSEC-A AJ71PT3 User Manual

3. SPECIFICATIONS
_ _ _ _ _ _ _ _ _ _--...JIMELSEC;4
3.4 Buffer Memory
The master module has a buffer memory (not battery backed) for
communication of data with the PC CPU.
3.4.1 Buffer memory assignment
Address
(Decimall
o
'0
to
4'
•
70
to
77
90
to
93
'00
to
to3
107
lOB
110
to
'4'
•
160
'61
to
'92
250
to
2B2
300
to
555
59B
599
600
to
B55
Number of remote
110 stations
Number of
retries
Transmission data
for batch refresh
Remote I/O station
card data
Accumulative faulty
station detection
Faulty station
detection
Communication
error code
Error detection
code
Receive data for
batch refresh
Line error
retry counter
Retry counter
Partial refresh
station
Transmission data
for partial refresh
Accumulative input
error detection
Input faulty station
detection
Receive data for
partial refresh
Refresh System Availability
Description
Batch refresh Partial refresh
Define the
remote
I/O station range for 1/0
0 0
refresh.
Define the number of retries at occurrence of
0 0
communication error.
Reserved - -
Stores data output to batch refresh type remote
0 X
I/O stations.
Reserved
-
-
Stores 110 unit types used as remote I/O stations.
0 0
Reserved
- -
Stores faulty station numbers until reset by the
0 0
sequence program.
Reserved
-
-
Stores the most recent faulty station numbers.
0 0
Reserved -
-
Stores the reason why X7 (MINI link communica-
0 0
tion error) has been switched on.
Latches the ON/OFF state of X6 (MINI link error
0 0
detection).
Reserved - -
Stores the input data
to batch refresh type
0 X
remote I/O stations.
Reserved
-
-
Stores the number of retries made when com-
munication cannot be made with all remote I/O
0 0
stations due to line error.
Stores the number of retries made to the faulty
0 0
station.
Reserved
-
-
Write the partial refresh type remote I/O station
numbers and the numbers of digits specified
X 0
(numbers of partial refresh times).
Reserved - -
Stores data output to partial refresh type remote
X 0
I/O stations.
Reserved
-
-
Holds the partial refresh input data receive error
X
0
until reset by the sequence program.
Stores the partial refresh input data receive
X 0
error.
Stores input data to partial refresh type remote
X 0
I/O stations.
I
C an be accessed
by tho
r
CPU.
f
Only read from
the PC CPU.
----of' - -----
Can be accessed
by the PC CPU.
Only read from
the PC CPU.
T
C an be accessed
by the PC CPU.
Only read from
the PC CPU.
t
•
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