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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(4)
PC CPU number
The PC CPU number determines which PC CPU on MELSECNETIB to
access.
The PC CPU number may be from OOH to 40H (OOH to 1FH in MELSEC-
NETIB) in 2-digit ASCII (hexadecimal).
(a) Accessing PC CPUs of other stations in a MELSECNET(1B) of an
AlSCPU
Set all PC CPU numbers to FFH (self) using the computer. Use any
function except the on-demand function.
(b) Accessing PC CPUs on MELSECNET(1B) equipped with AlSJ71C24
1) When computer and master station are connecterd
MELSECNET local and remote I10 stations: Set each slave link
station number (1 to 64) in hexadecimal (01 H to 40H)
MELSECNETIB local stations: Set each slave link station num-
ber (1 to 32) in hexadecimal (01 H to 1 FH).
2) When computer and AlSJ71C24-R2 of a local station are con-
nected
MELSECNETIB master stations: Set the PC CPU number to OOH
(c) The range of PC CPUs which can be accessed by setting the PC
CPU numbers is shown below.
1) MELSECNET
.................................
.........
1 - 1
:
M
Master station
(1 st tier)
i
:
L1
........
Local station
(2nd tier)
:
....
:
L2im
Local station
(2nd tier)
:
;
Master stalion
:
L3
........
Local station
(2nd tier)
j
.......
:
R4
Remote
1 1 0
station (2nd tier)
i
:
I1
.........
Local station
(3rd tier)
:
.........
-
- I
:
1 2
Local station
(3rd tier)
:
........
:
r3
Remote
1 1 0
station (3rd tier)
j
.........
:
1 4
Local station
(3rd tier)
j
r3
o...... Access to all devices possible by setting appropriate
PC CPU numbers
....
0 . 1
Access to special-function module butfer memory possible
by
settina amrmriate PC CPU numbers
A1
SCPU Loaded
with
AlSJ71 C24
Connected
to
Computer
M
L1
PC CPUs to Which a
Link
i s Possible (PC CPU Number)
H (1)
x
X
R4 (4)
0'1
X
Self
(FF)
o
0
1 2 (2)
x
X
L1 (')
o
-
(O)
-
0
r3 (3)
x
X
LZ' m
(210)
o
X
1 4 (4)
x
X
L3 (3)
o
X
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