Before using the Ethernet at the factory production level, you must understand the seven elements that you can introduce.
1. Network layout
The office network topology layout does not apply to the plant production layer, where the plant / machine Ethernet topology is used. Office Ethernet infrastructure is usually built from commercial-grade products that work well in a switched network of thermostatic environments and star topology; unlike this, industrial Ethernet architectures often face Change the situation, so need to have some additional features, such as high-speed redundancy and so on. Industrial Ethernet will use a variety of different topology network layout (star, ring, tree, line), and the use of shielded cable, metal connector, with a higher thermal shock resistance. In addition, industrial Ethernet switches are generally configured and maintained by the corresponding automation system integrators.
2. Communication protocol
For control system integrators, the most important thing is to realize that Ethernet is just a network architecture that enables it to communicate between autonomous devices, so you need an industrial-grade communication protocol. The IEEE 802.3 Ethernet standard defines the structure of the wiring, data read and write rules, and Ethernet architectures. Although different devices using this network standard can communicate in the same network segment, the prerequisite is that they must use the same network protocol, or "communication language". Profinet is a communication protocol designed for industrial applications that provides the functionality for distributed I / O, machine-to-machine connectivity, machine security, and motion control.
3. Processing capacity
This is not simply determined by the speed of the network, but how to quickly and accurately transfer the data to where it should go. The processing power of the network is undoubtedly one of the most critical factors, its measurement is the amount of time per unit of network data transmission. The only way to improve this performance is to reduce the number of cycles in the communication stack. The number of cycles in the Profinet communication stack is ten times less than a standard Ethernet TCP / UDP tool. This is due to the fact that Profinet has set up an Ethernet real-time channel for some important work that has harsh requirements for time, and at the same time its communication, configuration, diagnostics, routing, and "large-capacity data transmission" IP channel completed.
4. Network configuration
The setting of the network is simple, but more importantly, the programming work to achieve communication is absolutely not too complicated. Profinet is able to communicate between devices by configuring rather than programming. The system integrator and the end user can save at least 25% of the time to build and commission the commissioning by means of an object that echoes the internal communication between the devices, rather than the traditional method of programming debugging.
5. Early planning
Only consider the immediate application is not enough, the current Ethernet must be able to meet all future possible application needs. Profinet enables users to implement a highly integrated, multi-point control, distributed I / O, machine security, motion control, and data acquisition, based on their own pace, using a single Ethernet network ) Of the automatic control system. It is also prepared for future possible expansion.
6. Old system transformation
The elements of Industrial Ethernet are not limited to Ethernet itself, how to integrate with the existing network and different suppliers of machines and work, is one of the issues that must be considered. Since Profinet uses a standard Ethernet switch and uses TCP / IP protocol components, Profinet-based systems should be able to apply the entire autonomous network without the need for additional high-end switches or special functions such as IGMP snooping and VLAN. Profinet also provides a solution to access different vendors' products to the same network. Through XML, it takes each machine as a component to handle, relatively independent of the internal core of the control system, which is the component as the control unit of the automation concept.
For industrial Ethernet networks, the most important expense is not to build the components of the network, but to design, install and maintain the part. Profinet and other similar industrial Ethernet architectures use IT technology results, such as OPC and SNMP, to monitor and display the status of the network. In addition, its diagnostic function can be directly in the network state, including PLC and SCADA systems, including automatic control system reflected. This configuration setting and fault finding can be done in the central control room, greatly simplifying the operation.