Simply put, PROFINET = PROFIbus + etherNET, the Profibus master-slave structure is ported to Ethernet, so profinet will have Controller and Device, their relationship can simply correspond to Profibus Master and Slave, of course, there is a difference, But this correspondence can help understanding. In addition, since the profinet is based on Ethernet, it can have Ethernet star, tree, bus and other topologies, while profibus is only bus type. Therefore, profinet is the product of combining the master-slave structure of profibus with the topology of the ethernet. Other features such as isochronism and Siemens are in fact Ethernet. However, profinet can improve isochronism because of the control unit such as Controller. Accuracy only. PROFINET is a new Ethernet communication system developed by Siemens and the Profibus Users Association. PROFINET has communication capabilities between multiple manufacturers' products, automation and engineering modes, and is optimized for distributed intelligent automation systems. Its application results can greatly save configuration and commissioning costs. The PROFINET system integrates Profibus-based systems and provides protection for existing system investments. It can also integrate other fieldbus systems. PROFINET is an advanced communication system that supports distributed automation. In addition to communication functions, PROFINET also includes specifications for distributed automation concepts, which are based on manufacturer-independent objects and connection editors and XML device description languages. Ethernet TCP/IP is used for less time-critical communications between smart devices. All time-critical real-time data is transmitted via the standard Profibus DP technology, and data can be integrated into the PROFINET system via the Profibus DP network. PROFINET is the only bus that uses existing IT standards and does not define its proprietary industrial application protocol. Its object model is based on Microsoft Corp.'s Component Object Model (COM) technology. For the interaction between all distributed objects on the network, Microsoft's DCOM protocol and standard TCP and UDP protocols are used. In the PROFINET concept, equipment and plants are divided into technology modules, each of which includes mechanical, electronic and application software. The application software for these components can be developed using a dedicated programming tool and downloaded into the relevant controller. These dedicated software must implement the PROFINET component software interface and be able to export PROFINET object definitions as XML languages. The XML file is used to enter the manufacturer-independent PROFINET connection editor to generate PROFINET elements. The connection editor defines the exchange operations between the PROFINET elements on the network. Finally, the connection information is downloaded via Ethernet TCP-IP to the PROFINET device. PROFINET (real-time Ethernet) is based on Industrial Ethernet and has a very good real-time nature. It can be connected directly to field devices (using PROFINET IO), using a modular design, and PROFINET supports a distributed automatic control mode (PROFINET CBA, equivalent to the master station Inter-communication). After Ethernet has been applied to industrial control applications, Ethernet that has been used in industrial sites has become an industrial Ethernet. If you have ever used a Siemens network card CP343-1 or CP443-1 to communicate, you may have applied ISO or TCP connections. The TCP and ISO that are used in this way are the protocols applied to Industrial Ethernet. PROFINET is also a protocol in Siemens SIMATIC NET, specifically a collection of many protocols, including real-time protocols such as PROFINET IO RT, CBA RT, IO IRT, and so on. Therefore, PROFINET and industrial Ethernet cannot be compared. It can only be said that PROFINET is a real-time protocol running on industrial Ethernet. However, it is often said that some networks are PROFINET networks. This is because the PROFINET protocol is used on this network.
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