Main Differences Between PROFIBUS and PROFINET
PROFIBUS refers to a universal fieldbus used in automation technology that enables the distribution of digital automation devices at the field level. PROFINET, on the other hand, is the Industrial Ethernet standard and is used in applications where fast data communication over Ethernet networks combined with industrial IT functions is required. PROFINET is based on Ethernet-TCP/IP and is standardized in IEC 61158 and IEC 61784.
PROFIBUS and Its Functionality
PROFIBUS stands for Process Field Bus and enables fast communication between controllers and actuators or sensors from different manufacturers.
Structure of a PROFIBUS System
The PROFIBUS system comes in three different versions:
- PROFIBUS DP: This version focuses on the control of actuators and sensors by a central controller.
- PROFIBUS PA: Suitable for explosive environments due to the low power consumption of instruments, it is used particularly for communication between measurement and process devices, actuators, and process control systems in process and manufacturing technology. With a data transmission rate of up to 31.25 kbit/s, it also supports long cable lengths.
- PROFIBUS FMS: The predecessor of PROFIBUS DP, based on the earlier Manufacturing Automation Protocol (MAP) and Manufacturing Message Specifications (MMS). The FMS variant was originally used for complex plants and machines but is increasingly being overshadowed by PROFIBUS DP.
PROFINET and Its Functionality
PROFINET stands for Process Field Network and is an Industrial Ethernet standard that utilizes IT standards for comprehensive application in manufacturing automation. With PROFINET, applications for process automation, manufacturing technology, building automation, and drive technology can be implemented.
Structure of a PROFINET System
The PROFINET concept is modular. The variants primarily differ in the type of data exchange to meet high-speed requirements. The following variants are distinguished:
- PROFINET CBA (Component Based Automation): Designed for component-based communication over TCP/IP and real-time communication in modular plant construction.
- PROFINET IO (Decentralized Periphery): Tailored for real-time and synchronized communication with decentralized peripherals. PROFINET IO describes the entire data exchange between masters and slaves, as well as their parameterization and diagnostics.
These two variants can be integrated either separately or together within the same bus system.
PROFIBUS vs. PROFINET
The advantages of PROFINET over PROFIBUS include real-time capability and the modular concept, which allows users to select functionalities themselves. Additionally, a PROFINET interface ensures seamless integration of other fieldbuses.