Introduction to PROFINET protocol stack communication technology

Infineon / Mitsubishi / Fuji / Semikron / Eupec / IXYS

Introduction to PROFINET protocol stack communication technology

Posted Date: 2024-02-05

PROFINET is a communication protocol used by industrial automation systems. It is an Ethernet-based protocol that allows communication between industrial control systems and devices such as sensors, actuators, and other controllers. PROFINET was developed by PROFIBUS International and is a widely used protocol in the manufacturing and industrial automation fields.

The PROFINET protocol stack is the implementation basis of the PROFINET communication protocol. It consists of multiple layers, each layer has specific functions and effects. The following are the main layers of the PROFINET protocol stack:

Physical Layer: Responsible for transmitting data, including sending and receiving data. In this layer, it defines the transmission medium, transmission rate, signal encoding, etc.

Data Link Layer: Responsible for encapsulating data into data frames for transmission in the physical layer. In this layer, it defines the frame structure, data transmission method, error detection, etc.

Network Layer: Responsible for transmitting data from one node to another node. In this layer, it defines the address scheme, routing rules, data sharding, etc.

Application Layer: Responsible for handling communication between applications. In this layer, it defines various services and protocols, such as real-time transmission protocol (RTU), non-real-time transmission protocol (NRTU), configuration protocol (DP), IO device protocol, etc.

User Layer: Responsible for handling data exchange between user applications. In this layer, it defines the interfaces and communication rules for various user applications.

These layers together constitute the PROFINET protocol stack. Through the collaborative work of these layers, reliable and efficient real-time communication and control can be achieved.

Can the Profinet protocol stack run in ordinary Ethernet?

Yes, the PROFINET protocol stack can run in ordinary Ethernet. PROFINET is an Ethernet-based real-time data communication protocol designed to be used in the field of industrial automation. It is built on the IEEE 802.3 Ethernet standard and adds features required for real-time communications and industrial automation.

The PROFINET protocol stack embeds a PROFINET protocol adapter (PA) or PROFINET I/O device into an Ethernet controller, thereby integrating PROFINET into conventional Ethernet hardware. Data communication is achieved using standard Ethernet switches and supports TCP/IP and UDP/IP protocols. This means that, with the help of the PROFINET protocol stack, Ethernet can be used as the basic network to achieve efficient real-time communication between industrial automation equipment.

The design of the PROFINET protocol stack takes into account the requirements of Ethernet-based control systems and provides real-time performance, reliability and flexibility. It supports real-time data transfer and configuration, diagnostic and management functions. By using the PROFINET protocol stack, ordinary Ethernet equipment and infrastructure can be used to build a reliable industrial automation system and achieve high performance and real-time control.

In order to ensure the reliability and real-time performance of the PROFINET protocol, some network configuration and performance optimization measures may be required, such as assigning dedicated virtual LANs (VLANs) or priority configurations to PROFINET communications and implementing appropriate network load management.

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