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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)
St. No. :Station number
esignation Method
Test (random write, word) command
Character area C
--
Designation in protocol 1 is shown below.
To designate the device range, the following condition must be met:
L
*
.
I
1
s
number of device points s 20 (20 units for bit devices where 1 unit
corresponds to 16 points)
I
-
-
esignation Example1
To change the present value in AlSCPU as indicated below.
(Message wait time is 0 msec)
expressed in 4 digits (hexadecimal).
I
sum
Zk
HIL
hmputer
A
f
Each bit indicates
reset (OFF) 10, and
set (ON)
a
I.
il
S171 C24
Designates the head
\
device when the bit
1 point of device uses 4 characten.
device is designated
Therefore, a 1 -word data is
Check sum is calculated within this range.
.
-
I
~o
st
HIL
I
~o
PC
H I L
I I I I I I I I
I
Devics
I
Data
IScharezt-)
1 ( 4 c h r W
I
I I I I I I I I
E
O O i O O 6 4 0 2
C A
K
m.
I I I I I I I i
i
Devise
I
Defe
15charete)
I I I I I I I I
I
I
IS171 C24
4 'i
+
L
I .
,u*&hsi.,w.
O O F F
a*,u*(b.&
Indicates to change the
data in D500 to 1234H
I
St
No
H I L
u*
O F F W T O
a
I
PC
N o
HlL
(4660 in decimal).
the data in Cl00 to
: : : : : : : : : : : : : : : :
64H(IOOindecimal).
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
F
E
D
C
B
A
S
S
7
8
5
4
3
2
1
0
l
O
l
l
l
l
o
O
l
o
l
O
l
o
o
l
I
N ~ r n t e r d
wimpant.
(2cheiederS
(kxedecimd)
H
I
L
to change
I
~
D
O
~
O
~
~
~
~
~
~
Y
O
~
O
O
~
B
C
A
S
C
N
~
~.,~.,~,~*,~*I~~.,E.,U.,~.~.,~.,~~.,~,~*!~~~,U*,II~,B~~,C~,II~,IL,~.I~.,~,Y.~Y~D*D*QII
0
u*,u.
I
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