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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(2)
Extension comment memory batch read
Batch read of the extension comment memory using an AnACPU dedi
cated command is shown below.
?signation Method]
St. No. :Station number
Designation in protocol 1 is shown below
Extension comment
memory batch read
POINTI
To set the number of bytes, the following conditions must be met:
Character area A
1
5
number of bytes
5
128
(Head address)
+
[(number of bytes)
-
I ]
5
extension coment
memory capacity
esignation Example1
To read 6 bytes of data from the extension comment memory beginning with 7DOH (2000
decimal) in station "1". (Message wait time is 0 msec)
Computer
(Number of bytes) x 2.
I
I
I
I
.
Check sum is calculated within
this range
-
Check sum is calculated
within this range
I
Number of characters =
I
l o ! . ; :
,,.,
! , . i : : " , & ! ! . ;
<, , ,
: ! . ! % "
~:;:~",:~!,>,",::";!:",:,>.i~!"':,"
-\
-Ay-.-&
111
121
I31
141
151
16)
Indicates that:
( I )
the content of address 07DOH is 12H.
(2) the content of address 0701 H is ABH,
(3) the content of address 07D2H is 43H,
(4) the content of address 07D3H is EFH,
151 the content of address 07D4H is I C H . and
1
1
1
1
i6j the content of address 07D5H is 57H.
I
Character
area B
A
;
Computer
1 address is expressed in
l b y t e (Zcharacters).
)
st.
No,
HIL
AJ71 C24
P
Designation of the
range to be read
PC
No,
HIL
;
7
X
hexadecimal)
~~~d addresr
15cnaracterr
I
I
I
I
E
T
X
Sf.
No,
H I L
1
s u m
check
code
H I L
I
st.
No
HIL
hexadecimal1
~~~b~~
bytes
(2characters
I
code
sum
check
H I L
PC
No,
HIL
I
G2
HIL
I
D L i "
exten!
s,on
corn-
men; m y o r y
I
,
I I
I I
D R
I
M e , , , , ,
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