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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(2) Sequence program batch read (ACPU common command)
?signation Methodl
St. No. :Station number
Designation in protocol 1 is shown below.
Number of characters = (Numbel
Character area
A
of steps)
x 4
I
l
l
I
l
l
1 step (16 bits) uses 4 characters.
St.
PC
M R
A
St.
PC
;
N O
N O .
HlL H l L
I
I
I
I
1
H I
L
HIL HIL
I
-
I
I
I
AJ71 C24
Designation of the step
Sequence program
Sum
St.
PC
8
8
range to be read
:,
NO.
NO.
( - (
T
check
5
1
X code
H I L H I L
I I I I I I I I
H l L
Sequence program batch read command
Character area
B
(MRfor main and SRfor sub program)
(1) To designate the number of steps, the following condition must
b e met:
(
.I
5
number of steps
5
64
I
(2)
Timers, counters, and a sequence program cannot be used
in combination. Only one of these may b e set.
I
esignation Examples1
Example 1:
To read
3
steps: step 100 to step 102 of the main sequence program of the PC CPU in
station number "0". (Message wait time is 0 msec)
Indicates that:
The content of step 100 (64H) is 4001 H
'
The content of step 101 (65H) is 8002H
The content of step 102 (66H) is 101 1 H
A
Check sum
is
calculated
within this range
I
I
I
A
K
&
Computer
0 3
C O O F F
M R
AJ71 C24
/
Step 100 is expressed as
0064H in hexadecimal
X1,D1ib.,:6x
E
N
0
E
8
0
Check sum is calculated
this range
.
o
0
0 0 8
4
oSm)O~,Xl,~ir,ib.1h,S?13311)a,9~,&lH~yl~,ll~il~,B~
F F
E
x
T O C F F 4 0 0 1 ~ 8 0 0 2 1 1 0 1 1 T 4 1
~ & , : 6 . ~ ~ n , x ~ , ~ o ~ , 3 ! ~ ~ x ~ , ~ , , ~ o ~ , ~ ~ ~ ~ ~ n , ~ ~ , ~ ~ . , 3 ~ ~ o ! x
S
x
02"
Y X , ~
XS,DM
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