Table of Contents
Advertisement
8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(2)
Comment memory batch read (ACPU common command)
)esignation Method
1
St. No. :Station number
Designation in protocol
1
is shown below.
Comment memorv batch
read command
Character area A
Number of characters
=
I
l
l
I
1
x 2 .
rang; to be read
1 ; 1
No.
St.
(
NO.
PC
(
memory
,
I
,
I
I
I
1
1 1
I
Designation of the
c
Comment
Sum
T check
X
code
H l L
Character area
B
I
To designate the number of bytes, the following conditions must be met:
1
c
number of bytes
c
128
(Head address)
+
[(number of bytes)
-
11
c
Comment memory
capacity
I
esignation Example/
To read
6
bytes of comment memory data beginning with address 7DOH (2000 in decimal)
in the PC CPU of station number"1". (Message wait time is 0 msec)
~tZ~~X~~3l~~46~~Jhw,~~~4l~~4Z~~Y1JJ~~0~~1~~~31~,O~~3I1,37).I~~I1.,i
- i i - - - -
(11
(2)
(31
(41
( 5 )
(6)
Indicates that:
(1)
the content of address 07DOH is 12H.
(2) the content of address 07DIH is ABH,
(3) the content of address 07D2H is 43H.
(4) the content of address 07D3H is EFH.
(5) the content of address 07D4H is I C H , and
(6)
the content of address 07D5H is 57H.
.
Check sum is calculated within
Computer
E
o
0
fim~r,~i14s~,4t.cs,,u.n.m.,31.,ri.,lo,~lo.,a.;s
s.
O
AJ71 C24
'check sum is calculated
'a
s
32-,3l.
F F
within this range
O
0 0
6
4 6 ~ , + & ~
I
I
I
I
I
1 21A B 1 4
31E
F'l
C 1 5 7
I
,
,
,
,
T
X
B
0
1
T
1
this range
(Sum check code is added by
the AJ71 C24.)
A 8
A
K
C O I F F
Advertisement
Table of Contents
