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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
MESLECNET is used for the 1st and the 2nd tires, and MEL-
SECNETIB is used for the 3rd tire
M
........
Masterstation
(1st tire
j
L1
.......
Local station
(2nd tire1
,
k
.......
Local station
(2nd tirej
I
L3lm
...
Local station
(2nd tire)
Master station
.........
I1
Local station
(3rd tire)
I
$2
......
Local station
'3rd tirej
:
r3
........
Remorl 110 Station [3ra
P m
j
1 4
. . . .
Local
station
(3rd tare1
o......
Access to all devices pssible by setting appropriate
PC CPU numbers
AlSCPU
Loaded
w i t h A1
SJ71C24
Connected
l o Computer
M
L1
(5)
Command
Used to specity the operation required, e.g. read, write, etc. Commands
must be in 2-digit ASCII.
PC CPUs l o Which
a
Link is Possible (PC CPU Number)
(6)
Message wait time
This is a time delay required for some computers to switch from send to
receive states. The message wait time determines the minimum waiting
time before the AlSJ71C24 sends data after receiving it from the com-
puter. Set this time in accordance with the computer specifications.
The message wait time may be set between 0 and 150 msec in units of
10 msec. The time is set from O H to FH (0 to 15) in 1-digit hexadecimal,
where 1 corresponds to 10 msec,
r3
(3)
x
X
Self
(FF)
o
0
Example: Setting the message wait time
14
(4)
x
X
L2
(2)
o
X
M
(0)
-
0
I
Transmission starts 100
msec
later.
I
L3lm
(310)
o
X
L1
(1)
o
-
Message wait time
Waiting time
(1
00
msec)
not required.
Computer
R4
(4)
x
X
"K
I1
(1)
x
x
AlSJ71 C24
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