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(8) Station number 01(8) Station number 02(8) Station number 03(8)

： Sending area ： 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.

Function

 

Contents

 

 

 

Relay link

N: M communication

Total no. of link points : 2048 max. (256 bytes)

 

 

 

Register link

N: M communication

Total no. of link bytes : 2048 max.

 

 

 

(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.

Master station (PC00)Slave station (PC01)Slave station (PC02)

コ０２００ コ０２０１ コ０２０２

PC00 Program

PC01 Program

PC02 Program

9

02000

02000

02000

 

：Send ：Receive

02010

02010

 

02010

02020

02020

02020

•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.

 

７

６

５

４

３

２

１

０

 

７

６

５

４

３

２

１

０

コ０２００

 

 

 

 

 

 

 

 

コ０２００

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the same value as ｺ0200 of the master station.

 

７

６

５

４

３

２

１

０

 

７

６

５

４

３

２

１

０

コ０２０１

 

 

 

 

 

 

 

 

コ０２０１

 

 

 

 

 

 

 

 

 

Is the same value as ｺ0201 of the slave station.

9·2