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9·2
Station number 00(8) Station number 01(8) Station number 02(8) Station number 03(8)
Sending area
Receiving area
noitcnuF stnetnoC
knilyaleRnoitacinummocM:N)setyb652(.xam8402:stniopknilfo.onlatoT
knilretsigeRnoitacinummocM:N.xam8402:setybknilfo.onlatoT
Master station (PC00) Slave station (PC01) Slave station (PC02)
Send
Receive
Program Program Program
Is the same value as
0200 of the master station.
Is the same value as
0201 of the slave station.
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.
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.
(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.
• 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.