Hi all,

how to read/write register between TWIDO PLC & VB 6.0 directly???? without OPC server. can anyone give me the source code please??

is each PLC have different code for read/write from VB 6.0??

thanks,

regards,

ariez

 

If I remember well, the Twido PLC is modbus enabled...
So if I'm right, you'll find a lot of stuff in VB and modbus protocol... Good luck!

 

TWIDO controllers support Modbus Master and Slave.

Check out http://www.automatedsolutions.com for a line of Modbus ActiveX Controls. Master and slave are available.

Fully functioning evaluation versions are available for download. VB6 example source code is included.

 

Hi
Twido PLC has a modbus protocol build in. You can download VB modbus project from http://www.modbus.pl

Regards
Andrzej

 

Look this website: http://www.modbus.pl
In the Twido you can read the %MW and the %M area.
If you use the programming cable You must set 19200, 8,1,None and slave address :1 .

Best regards!
Lothar

 

Use SIMATIC S7-200 it has some thing called PC access which will help you to connect to VB..

I am sure it will help you too

 

If I'm not wrong, twido modbus addrees = VB modbus address + 1. So if you want to read 4002 at twido, you must read 4003 at VB.

Rgds,
CH

 

hi,

I am working on a student project. I wish to know which cable would you use to connect a twido plc to pc. for modbus protocol is it the programming cable. have few more questions regarding scada for twido. will ask when i get a reply for these questions.

 

If you want to talk directly PC to twido, you have to use a cross over cable ethernet cable. If you are going through a LAN system then all cable must be straight.

it pretty easy, Let me know if you still have trouble.

Dan

 

I have to read register from TWIDO with Ethernet using VB6. I think that I must use ModbusTCP/IP protocol. I have find two good examples in http://www.modbus.pl/vb.htm and one in http://www.automationcorner.com/menujs.html?index.html

Is the first time that I use TWIDO and Modbus. Do you think that these samples are ok? Is there any problem in realising what I need?

Thanks vary much.
Best regards.
Ubi