根据工业用户未来应用的需要和变化，应具备充分的接入能力和可扩展性，包括多种接入方式的提供和接入的可扩展性，带宽的扩展与速率的平滑升级以及处理能力的可扩展性，最大程度地减少对网络架构和现有设备的调整。

　　2.4可管理性

　　考虑到工业用户下端设备分布比较分散，维护困难程度比较大，方案采用集中管理的网络架构，实时监测设备的运行状态，并可通过监控中心对下位机进行远程设置。

　　2.5兼容性和经济性

　　兼容性，能够最大限度地保证网络现有各种计算机软、硬件资源的可用性和连续性;经济性，在充分利用现有资源的情况下，最大限度地降低网络系统的总体投资。有计划、有步骤地实施，在保证网络整体性能的前提下，充分利用现有的网络设备或做必要的升级。

　　　　三、网络架构说明　3.2方案说明

　　工程现场：

　　实际的工程现场会由多种设备构成，这些设备的运行及状态将通过内置的一个或多个以太网PLC进行采集、监控。4G无线工业路由器内置100Mbps以太网接口，与现场一个或多个以太网PLC的以太网口相连，构成工程现场网络。4G无线工业路由器可通过西门子PLC的24VDC输出供电，且再上电后自动连接Internet，并与巨元监控中心前端的“VPN防火墙”建立加密安全隧道。

　　According to the future application needs and changes of industrial users, it should have sufficient access capability and scalability, including the provision of multiple access methods and scalability of access, bandwidth expansion and smooth rate upgrades, as well as scalability of processing capabilities, to minimize adjustments to network architecture and existing equipment.

　　2.4 Manageability

　　Considering that the distribution of industrial users' lower end devices is relatively scattered and the difficulty of maintenance is relatively high, the plan adopts a centralized management network architecture to monitor the operation status of the devices in real-time, and can remotely set the lower end machines through the monitoring center.

　　2.5 Compatibility and Economy

　　Compatibility, which can maximize the availability and continuity of various computer software and hardware resources in the network; Economical, minimizing the overall investment of network systems while fully utilizing existing resources. Implement in a planned and step-by-step manner, fully utilizing existing network equipment or making necessary upgrades while ensuring overall network performance.

　　3、 Network Architecture Description 3.2 Scheme Description

　　Engineering site:

　　The actual engineering site will be composed of multiple devices, and the operation and status of these devices will be collected and monitored through one or more built-in Ethernet PLCs. The 4G wireless industrial router is equipped with a built-in 100Mbps Ethernet interface, which is connected to the Ethernet ports of one or more Ethernet PLCs on site, forming the engineering site network. The 4G wireless industrial router can be powered by the 24VDC output of Siemens PLC, and automatically connects to the Internet after being powered on. It also establishes an encrypted security tunnel with the "VPN firewall" at the front end of the giant monitoring center.

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