Until the mid-1980s most factory floor communication was proprietary, consisting of a host control system connected via lengthy analog wires to the field devices and processing huge amount of information and knowledge concerning factory's production. As systems developed to handle more elaborate processes and automations the need for the machines to communicate in a faster, more intelligent manner arose. Fieldbus technology was subsequently developed, a two-way digital communication bus that can provide more and any kind of data. It eliminates the cost of analog wiring since connection between components is through twisted pair wiring or fibre-optic cable or wireless radio-frequency connection. Being an open system that is supported by several vendors allows the users-manufacturers using automation systems- to mix the best components for different functions. At the moment there are three main fieldbus organisations, three different communication protocols, working towards a common, international, non-proprietary fieldbus standard. Software compatible with any network standard has been developed to provide tools for application design, resource management, configuration management and simulation for this fast-moving technology. The tools were validated during real process applications at two complex plants, a chemical and a power plant. The software collaborated with the PROFIBUS fieldbus protocol, developed by Siemens AG. Important conclusions were drawn from the application of these advanced design tools. Use of the tools significantly improves the efficiency and quality of the design process. The tools can bridge the gap between industries and opportunities arising from implementation of fieldbus technology. Finally, fieldbus technologies themselves, enabling effective two-way communication between control and devices together with communication between devices can be successfully applied in sophisticated processes in demanding environments.