Modbus and OPC


Intelligent Plant has extensive experience of working with Modbus and OPC communications protocols, including implementation of OPC servers, interfacing with historians, metering systems and programmable logic controllers (PLCs), and troubleshooting connectivity issues.

Modbus was originally developed by Modicon in 1979, as a means of communicating with its PLCs. It provides a robust, open and royalty-free communications protocol and is used by numerous vendors as a means of transferring I/O and register data between control devices.

OPC (Open Platform Communications, formerly OLE for Process Control) is a set of communications protocols specified by the OPC Foundation, based on Microsoft COM and DCOM technologies, commonly used in industrial equipment and software such as PLCs and plant historians. OPC provides a common, vendor-neutral means of communicating with such systems.

Both protocols can be problematic to set up initially; our many years of experience can help you to avoid common pitfalls and reduce deployment time.