Table of Contents
Advertisement
8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.7.7
Testing device memory
in
units of words (random write)
(a) Using the WT command (ACPU common command)
3esignation Method]
St. No. :Station number
Designation in protocol 1 is shown below.
Test (random write, word) command
Character area C
1
To designate the device range, the following condition must be met:
I
1
1
c
number of device points
5
10 (10 units for bit devices where 1 unit
corresponds to
16
points)
)esianation E x a m ~ l e l
Computer
To change the present value in station number
'5'
as indicated below.
(Message wait time is 0 msec)
Check sum is calculated within this range.
.
3
E
h o m p l t e r
N O S F F W T O
0
3 D O 5 O O 1 1 2 3 4 Y O 1 O 0 ~ 8 C A 9 C N 1 0 0 ~ 0 O 6 4 O
Q
I
St
No.
4J71 C24
Indicates to change
(4660 in decimal).
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
thedatainCtOOto
1
1
1
1
1
f
1
1
1
1
1
1
1
1
1
1
64H(lOOindecimal).
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
F
E
D
C
B
A
9
8
7
6
5
4
3
2
1
0
Each bii indicates
reset (OFF) 8 0 , and
set (ON) # I.
HIL HIL
I
PC
No.
I
I
~ e s r a g e
*&time
AJ71C24
Designates the head
device when the bit
I
point of device uses 4 characters.
device is designated
Therefore, a 1-word data is
H l L
I
Numberof
dw'se points
@characters
(heradecimd
expressed in 4 digits (hexadecimal).
POINT/
I
/ \ = P C
NO.
H l L
I I I I I I I I
I
NO.
HIL
I I I I I I I I
D 4 c e
I
Data
l S s h a r a c k n ) i ( 4 ~ )
I I I I I I I I
. .
H I L
I I I I I I I I
Devise
1
Data
(5 character.) I
( 4 -
t
I
: % :
Advertisement
Table of Contents
