在未来的工厂中,几个硬件服务器将构成一个网格,该网格将仅通过添加或卸下服务器来添加或带走可编程逻辑控制器(PLC)处理功率。如果一台服务器失败,其他服务器会立即捡起它。
Nodes on this grid would share resources with one another, providing a large volume on which to run hundreds or thousands of virtual PLCs. These virtual PLCs would replace the hardware PLCs on the plant floor.
So as to ensure fast, reliable communication, the components (flow meters, pressure transducers, thermocouples, drives, HMIs, etc.) would communicate via a dedicated fiber-optic channel (strand) that runs between the component and the virtual PLC on the grid in the server room. Each component would generate the fiber signal in accordance with a common standard. Fiber signals are more durable than electronic signals, especially in electronically hostile environments like some plant floors. The communication would be faster than Ethernet because it is not going through switches and other devices that add latency.
Some of the benefits of this architecture might be: less cost; reduced downtime; better security; improved maintainability; centralized alarm notification and improved system and data logging; improved longevity of equipment; common standards to reduce incompatibility between vendors; centralized administration and change logging.
克里斯托弗说:“这就是我个人对未来所看到的PLC架构愿景。”“我可以看到的另一个创新是智能自动化的发展。”他提供了一个例子。
假设您为汽车制作仪表板。如果一个系统可以收到几个订单,以生产数千张仪表板和一个通行证,将每个仪表上一通道送到一个自动驾驶的手推车上,该手推车驻留在工作区域中,带有50个其他自主手推车。然后,想象一下每个购物车在过程中的位置,并找到自己的方式到达下一步,它可以与适用的站进行停靠,在该步骤中进行了工作。想象一下50个手推车相互独立运行,但彼此意识到,因此,如果一个站点上有一条线,它们会根据一套共同的规则确定优先级。其中一些规则可能是仪表板零件(皮肤,基板,安全气囊等)的可用性以及应制造的紧迫性。谁知道,也许可以通过为特定客户绑定的卡车的可用性或客户的指标来进一步定义紧迫性,以显示其仪表板的供应量很低。
克里斯托弗说:“也许是一种,或者两种创新在实践中,我根本不知道,在这种情况下,我有时会有时会听到更多有关这些信息的信息。”“如果他们没有实施,我可以看到它们在十年左右的时间内发生。”
Phil Christopher,phil.christopher@gmail.com,是Linden Industries的总监。