Profibus is an international fieldbus communications standard for linking process control and plant automation modules. Instead of running individual cables from a main controller to each sensor and actuator, a single multi drop cable is used to connect all devices, with high speed, bi-directional, serial messaging used for transfer of information

Profibus has two types of protocols

• 1. Profibus DP 9.6 Kbps to 12 Mbps speed
• 2. Profibus PA 32 Kbps