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9-2 Communication method
[1] Data link (standard function)
Each station sends data in its sending area cyclically and stores data received from other stations in
its receiving area.
Station number 00
For the JW-20CM to execute automatically these sending and receiving procedures, a special program
for communication is required. Data link have relay link and register link. They can use at the same
time.
F
u
n
t c
o i
n
R
e
a l
y
n i l
R
e
g
t s i
r e
n i l
(1) Relay link function
Mainly used for sending and receiving ON/OFF information
[Example] In the case of sending 1-byte data from a master station and slave stations 01 and 02.
コ０２００
コ０２０１
コ０２０２
9
• The link relay of the receiving station must be programmed as input signal by the PC program-
ming. Also, it may be used as source (S) side of application instruction.
• The sending and receiving data correspond in bits of one point unit.
コ０２００
コ０２０１
Station number 01
(8)
k
: N
M
c
o
m
m
u
n
c i
t a
o i
n
k
: N
M
c
o
m
m
u
n
c i
t a
o i
n
Master station (PC00)
PC00 Program
02000
02010
02020
７
６
５
４
３
２
１
７
６
５
４
３
２
１
Is the same value as
0201 of the slave station.
ｺ
Station number 02
Station number 03
(8)
(8)
C
o
n
e t
n
s t
T
t o
l a
n
. o
f o
n i l
k
p
o
n i
s t
:
2
T
t o
l a
n
. o
f o
n i l
k
b
y
e t
s
:
2
0
Slave station (PC01)
PC01 Program
02000
02010
02020
０
７
コ０２００
Is the same value as
０
７
コ０２０１
9
2
·
(8)
： Sending area
： Receiving area
0
4
8
m
a
. x
2 (
5
6
b
y
e t
) s
4
8
m
a
. x
Slave station (PC02)
：
：
PC02 Program
02000
02010
02020
６
５
４
３
２
１
０
0200 of the master station.
ｺ
６
５
４
３
２
１
０
Send
Receive
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