How to communicate PLC with a PC using VB


Thread Starter


My problem is to design a program so that it can interface a PLC connected with a series of electrical generators which give alarms both digital and analogous in nature . The PLC is supported by modbus protocol and communicate via ascii serial port. I need some tips and hints so that i can take some lead on my project.

Frank Mitchell

There are VB controls that you can purchase now that give high level programming access to PLC data from inside Visual Basic. Please check out and and They all push something called OPC server which I believe is the wave of the future. Visual Basic is becoming almost as easy to use as ladder logic and stand alone programs are not nearly as difficult to write anymore. Expensive HMI's hopefully will fade into obscurity.