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haiwellplc · Junior Joined: 05 Jul 2016 Posts: 8

Haiwellbus Protocol is a Protocol defined by Haiwell Co. for data transferring between Haiwell
PLCs. It is using RS485 CAN structure , so itcan transfer both discrete data and contiguous
data. It is faster and moreefficient . It can maximum acomplish 30 datas interactions in one
communication. When the Single PLC is not encough to control the devices orthe devices are widely
distributed .More PLCs are needed to control distributedly.

HaiwellPLC is powerful in networking. The Haiwell PLCs can not only communicate byHaiwellbus
protocol , but also by standard Modbus Protocol. Whatever protocolis used,the salve plc doesn’t
need to write any program.Only need to do write a programm in the master PLC.
Haiwellbus Protocol has two communication instructions ,HWRD( Haiwellbus reading instruction,
need to define “Haiwell bus readingcommunication table”) and HWWR (Haiwellbus writing
instruction , need to define“Haiwell bus writing communication table”). Here are the picture:

Suppose No.1 PLC read the data X0/M12/M300/M301/V100/V120/Y6 from No.2 PLC,and put it in
native M500/M501/M502/M503/V600/V601/M800 of No.1 PLC .We definea name “read No.2 PLC”
in Haiwell bus reading commucation table.:

Suppose No.1 PLC wants to write the native data fromM200/M301/Y2/AQ2/V10/V51/M800 to the No.3
PLC’s Y0/Y1/M300/V1/V10/V12/Y6 ,wedefine that name“write No.3 PLC ”in “Haiwellbus writing
communication table” asfollows:

Haiwellbus Protocol’s communication programming is simple. Toacomplish the data transferring
between Haiwell PLCs, it only needs 2instructions.

Xiamen Haiwell Technology Co., Ltd.

Add: 7th F, Torch Hi-tech Building, No.3699 Xiangan North Road, Xiamen, China
Tel：+86-0592-2230312
Fax：+86-0592-2230313
Web: www.haiwell.com