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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.8
Extension File Register Read and Write
An extension file register refers to an empty area of the PC CPU user memory
area used as a file register. The extension file register is used to store
necessary data, results of the calculation for data processing executed
using the SWOGHP-UTLPC-FNI software package, and dedicated instruc-
tions for extension files used in the AZACPU(S1) and A3ACPU.
8.8.1
ACPU common commands and addresses
(1)
ACPU common commands used for readlwrite of extension file registers
Item
Batch
read
Batch
write
Number
of
Points
Processed per
communica-
tions
Test
(random
write)
Note : o Executable
x Not executable
( 2 )
Extension file register addresses
ER
EW
1
Monitor
data
entry
Monitor
(a) The extension file register comprises blocks number
0
to "nu, with
"nu varying according to the memory cassette. Block number
"0"
contains t h e number of points designated by t h e PC CPU
parameters and each block with numbers 'I' to 'n' has 8192 points
of registers.
Processing
State of PC CPU
Command
ET
Readlwrite is possible in the range of parameters designated in
block number
0.
STOP
Sym-
b o l
45H,
52H
45H,
57H
EM
ME
(b) The range of block numbers which can be designated varies ac-
cording to the type of memory cassette and the PC CPU parameter
setting.
ASCII
Code
Specifies the extension file registers (R) in units
of
1
point using block or device number and
makes a random write.
The UTLP-FN1 Operating Manual or A2A(SI)/A3ACPU User's
Manual give details.
During RUN
Reads from extension file registers (R) in units
of 1 point.
Writes to extension file registers (R) in units of
1
point.
45H.
40H
4DH,
45H
SW22
ON
10
S W 2 i
OFF
64
64
Sets the device numbers to be monitored in
units of 1 point.
Monitors t h e extension file registers after
monitor data entw.
o
o
o
20
-
o
0
0
x
0
0
0
x
0
0
0
0
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