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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(3)
Sequence program batch write (ACPU common command)
POINTS
Designation Methodl
St. No. :Station number
Designation in protocol 1 is shown below.
Character area C
.
.
(1) To designate the number of steps, the following condition must
be met:
Computer
I
1
r
number of steps
r
64
I
(2) Timers, counters, and the sequence program cannot be used
in combination. Only one of these may be set.
E
Designation Examples
.
AlS171 C24
Designation of the step
range to be write
Sequence program batch write command
v
(MW
for main and SW for sub program)
Example 1 :
To write a program to
4
Steps: step 500 to Step 503 of the subsequence program of the
AISCPU. (Message wait time is 0 msec)
i
St,
NO.
HIL
Number of characters
=
(Number
of
steps)
x
4.
1 step (16 bits) uses 4 characters, Therefore.
1 step is expressed in 4 digits (hexadecimal).
A
;
I
PC
No.
HIL
Check sum is calculated within this range
.
3
I
SL
NO.
HIL
I
MW
&
I
I
PC
NO.
HIL
1 0 5 5 : 4 0 F ~ : 2 A 0 5 i 7 O A 8 . 4 8
II,JO~B*,II*IX,~~,~I*IYI,~I~,~,II*!~~,~.,~I,,~
Indicates that:
1055H is written to step 500 (I F4H)
40FAH is written to step 501 (1 F5H)
2A05H is written to step 502 (1 F6H)
70A8H is written to step 503 (1 F7H)
4
n . , &
A
K
E .
Me558ge
Wait time
AlSJ71C24
Step 500 is expressed as
01 F4H in hexadecimal
C o o 0 1
a . , %
I
I
I
y n g
step
Characters
hexadesimal)
I
I
I
&JI*
i
Number 01 s t e p
(2 ~ h a r a a e r e
hexadn;imsl,
I
I
Sum
C h ~ k
code
H I L
i
I
I
Sequencs
program
a
-
0
I
I
I
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