PROFIBUS (Process Field Bus) is a widely adopted fieldbus communication standard for industrial automation technology. Originally promoted by a consortium of German companies and now managed by PROFIBUS & PROFINET International (PI), it is designed for reliable, real-time data exchange between central controllers (such as PLCs) and distributed field devices.
Based primarily on the robust RS-485 serial communication standard, PROFIBUS is highly resistant to electrical noise, making it ideal for demanding industrial environments. The standard consists of two main variants:
- PROFIBUS DP (Decentralized Peripherals): This is the most common variant, optimized for high-speed, cyclic communication. It serves as the standard for factory automation, connecting controllers to devices such as drives, I/O modules, and programmable DC power supplies.
- PROFIBUS PA (Process Automation): Designed for process industries such as chemical or oil and gas, this variant allows for intrinsically safe operation in hazardous areas and can transmit both data and power over a single two-wire cable.
While the Ethernet-based standard, PROFINET, is often chosen for new, high-bandwidth system architectures, PROFIBUS remains a trusted and stable technology widely used in existing manufacturing facilities worldwide.