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高速确定性控制需要各种规模的PLC。当应用需要更多内存和I/O、模块化可扩展性、冗余和集成运动控制时,大型PLC可充分发挥其作用。这些大型PLC通常还具有支持OT/IT与边缘计算集成和更多协议选择的功能。但是对于无数需要本地控制的小型系统和机器来说,设计边缘就绪自动化的佳和具成本效益的方式是什么?设计人员不应仅仅因为是本地应用且I/O数量少,就被迫牺牲OPC UA、1Gb网络和加密数据传输等数据相关功能。要在不中断现有自动化的情况下仅连接几个I/O点,佳解决方案通常是在小型本地面板或分布式机器上的I/O站中添加模块化I/O。这些可以连接到附近的边缘就绪PLC,也可以通过PROFINET总线耦合器连接到任何支持边缘的控制器或IPC。可能会后者,这样就不会干扰当前正在运行的PLC。 在某些情况下,可能需要从可配置的安全控制器收集数据,例如可智能配置的安全继电器。这些设备中有许多支持PROFINET等工业通信协议,因此可以连接到边缘就绪或支持边缘的设备。主要区别在于,这些控制器可能还有大量可用的扩展和诊断数据。然而,对于许多新机器和改造的情况来说,佳解决方案是边缘就绪的紧凑型PLC控制器。这些规模合适的设备具有足够的I/O来处理常见需求,并且它们可以进行编程用于本地控制和/或监视。这些设备还可以执行数据预处理,例如实时计数器功能,根据外部一个离散量的输入来累加已生产多少零件。这些紧凑型PLC使用内置以太网口可以将信息传输给更***别的边缘设备。有许多类型的紧凑型PLC,但只有少数几种可以作为更大的产品组合的一部分少的努力就可以创建稳健的自动化项目。只有当自动化产品供应商成为了解挑战且的合作伙伴,并通过提供各种规模的PLC、边缘控制器、HMI、SCADA、运动控制器、伺服和驱动、安全装置等,让客户高枕无忧时,这才有可能实现。
This concept of consistency should also apply to control and edge implementation principles. Deterministic control is very different from general analysis and edge calculation. For performance and network security reasons, the two domains should remain separate, but can safely cooperate with each other.The deterministic side operates in a specific so-called guard rail to ensure safe and robust operation of the system. The logic program often changes, because it is production oriented, so it should be isolated from potential risk external influences, such as plant network and Internet connection. It needs to be tailored for ot personnel, who are usually more familiar with ladder logic and IEC language than it programming.Edge computing and iiot environments are configured in other more it centric languages, such as python, c++ and related applications. This aspect is not only oriented to the Internet (so network defense must be provided), but also develops rapidly, and should be easier to update without affecting deterministic operations. However, the edge computing task must be able to safely interact with the deterministic side to collect data and provide operation setting updates.
A comprehensive automation product portfolio should include deterministic control, edge computing, i/o, security, and even motion control products designed for collaborative work. Users should only need to learn how to use a set of development software, so that they can consistently carry out deterministic programming and deploy it on an appropriate scale platform. Similarly, whether deployed on edge controllers, IPC or servers, edge code and applications, or HMI Software suites that support edges, should run consistently.
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