P
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L.
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4
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8.
COMMNICATIONS
USING
DEDICATED PROTOCOLS
MELSEC-A
ledgnrtlon Method]
Designation in protocol
1
is shown
below.
St.?&.:SW5onnurnbu
I
IHILIHILI
I
I
I
I
I
I
I
I
H
I
L
I
H
I
L
lHlLlHlLl
IHILIHILI
A171
C24
'OINTS
1
(1) To designate the byte length, the following condition must be met:
01
s
byte length
I
128
(2)
With
some special function modules,
2
or 3 bytes are used to
express the data. Therefore, designate the
byte
length by referring
to the manuals for each individual module.
le8ignrtion
Example]
To
write the data to buffer memory address 27FAH
to
27FDH
(4
bytes) of the
special-function module (module number 13H) loaded at
I/O
numbers 120 to 13F in
station number
"5".
(Message wait time is
0
msec)
Check sum is calculated within this range
Computer
IIIIII
I
E
0
NOSFFTWOO27FAO4l3Ol~CD~ABB]EFAA
1II
Indicates that:
Data "01
H"
is
written
to
address 27FAH
Data 'CDH' is written
to
address 27FBH
Data
'ABH"
is
written
to
address 27FCH
Data 'EFH' is written to address 27FDH
L
r
8-75
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