ABB PM891K01 3BE053241R1处理器单元是一种高性能CPU模块，用于ABB的System 800xA分布式控制系统。它旨在为石油和天然气、发电和化学加工等行业的复杂控制和自动化应用提供快速可靠的处理能力。ABB PM891 模块 控制器特点：安全性高 安全度高、高精度，安全 耐用。与PLC控制器控制系统连接的各类信号传输线，除了传输有效的各类信息之外，总会有外部干扰信号侵入。此干扰主要有两种途径:一是通过变送器供电电源或共用信号仪表的供电电源串入的电网干扰，这往往被忽视;二是信号线受空间电磁辐射感应的干扰，即信号线上的外部感应干扰，这是很严重的。由信号引入干扰会引起I/O信号工作异常和测量精度大大降低，严重时将引起元器件损伤。
PM891
对于隔离性能差的系统，还将导致信号间互相干扰，引起共地系统总线回流，造成逻辑数据变化、误动和死机。PLC控制器控制系统因信号引入干扰造成I/O模件损坏数相当严重，由此引起系统故障的情况也很多。接地是提高电子设备电磁兼容性(EMC)的有效手段之一。正确的接地，既能电磁干扰的影响，又能设备向外发出干扰;而错误的接地，反而会引入严重的干扰信号，使PLC系统将无法正常工作。PLC控制器控制系统的地线包括系统地、地、交流地和保护地等。接地系统混乱对PLC控制器系统的干扰主要是各个接地点电位分布不均，不同接地点间存在地电位差，引起地环路电流，影响系统正常工作。例如电缆层必须一点接地，如果电缆层两端A、B都接地，就存在地电位差，有电流流过层，当发生异常状态如雷击时，地线电流将更大。
PM891
The ABB PM891K01 3BE053241R1 processor unit is a high-performance CPU module used in ABB’s System 800xA distributed control system. It aims to provide fast and reliable processing capabilities for complex control and automation applications in industries such as oil and gas, power generation, and chemical processing. ABB PM891 module controller features high safety, high precision, and durability. The various signal transmission lines connected to the PLC controller control system, in addition to transmitting effective information, will always have external interference signals invading. There are two main ways for this interference: firstly, it is caused by the power supply of the transmitter or the power supply of the shared signal instrument connected in series to the power grid, which is often overlooked; The second is that the signal line is interfered by the induction of spatial electromagnetic radiation, that is, external induced interference on the signal line, which is very serious. Introducing interference from signals can cause abnormal operation of I/O signals and greatly reduce measurement accuracy, and in severe cases, it can cause component damage.
PM891
For systems with poor isolation performance, it will also lead to mutual interference between signals, causing backflow of the common ground system bus, causing logical data changes, misoperation, and crashes. The number of I/O module damage caused by signal interference in the PLC controller control system is quite serious, and there are also many cases of system failures caused by this. Grounding is one of the effective means to improve the electromagnetic compatibility (EMC) of electronic equipment. Proper grounding can not only reduce the impact of electromagnetic interference but also cause external interference from the equipment; However, incorrect grounding can actually introduce serious interference signals, making the PLC system unable to function properly. The ground wire of the PLC controller control system includes system ground, ground, AC ground, and protective ground. The interference of the chaotic grounding system on the PLC controller system is mainly due to the uneven distribution of potential at various grounding points, and the existence of ground potential differences between different grounding points, causing ground loop current and affecting the normal operation of the system. For example, the cable layer must be grounded at one point. If both ends A and B of the cable layer are grounded, there is a ground potential difference, and there is current flowing through the layer. When an abnormal state such as lightning strikes occurs, the ground wire current will be greater.
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