Fieldbus System acts as local area networking medium needed for industrial automation job. It is considered as a good substitute of centralized controlling network that can be used for linking independently operated actuator, transducer, sensor etc. It supports two way communication function so that the user can write and read data into sensors or transducers. Fieldbus System has 31.25 kbps transmission speed and it supports terminal bard and cable or pressure clamp based terminal for its installation. Reliable operation is one of its key features.