系统接地方式有浮地方式、直接接地方式和电容接地三种方式。对PLC控制系统而言，它属于高速低电平控制装置，应采用直接接地方式。由于信号电缆分布电容和输入装置滤波等的影响，装置之间的信号交换频率一般都低于1MHz，所以PLC控制系统接地线采用一点接地和串联一点接地方式。集中布置的PLC系统适合并联一点接地方式，各装置的柜体中心接地点以单独的接地线引向接地极。如果装置间距较大，应采用串联一点接地方式，用一根大截面铜母线（或绝缘电缆）连接各装置的柜体中心接地点，然后将接地母线直接连接接地极。
PP835
PP835是ABB集团推出的一款高性能可编程逻辑控制器（PLC），专为工业自动化应用而设计。PP835具有紧凑的设计、高处理速度和广泛的通信选项，适用于各种控制和监控任务。同时，PP835提供了多种高级功能，包括支持多种编程语言、内置诊断和在线编辑功能，还支持广泛的输入和输出模块，允许对其进行定制，以满足几乎任何应用程序的需求。除了硬件功能外，PP835还配备了一个全面的软件包，其中包括用户友好的编程环境、广泛的调试工具以及一系列预先构建的功能块和库。
PP835
There are three grounding methods for the system: floating grounding, direct grounding, and capacitive grounding. For PLC control systems, they belong to high-speed low-level control devices and should be directly grounded. Due to the influence of distributed capacitance of signal cables and filtering of input devices, the signal exchange frequency between devices is generally lower than 1MHz. Therefore, the grounding wire of PLC control system adopts one point grounding and series one point grounding methods. The centrally arranged PLC system is suitable for parallel connection with a single point grounding method, and the central grounding point of each device’s cabinet is led to the grounding electrode with a separate grounding wire. If the distance between devices is large, a series connection with a single point grounding method should be adopted. A large cross-section copper busbar (or insulated cable) should be used to connect the central grounding point of each device cabinet, and then the grounding busbar should be directly connected to the grounding electrode.
PP835
PP835 is a high-performance programmable logic controller (PLC) launched by ABB Group, designed specifically for industrial automation applications. The PP835 has a compact design, high processing speed, and a wide range of communication options, making it suitable for various control and monitoring tasks. At the same time, PP835 provides multiple advanced features, including support for multiple programming languages, built-in diagnostic and online editing functions, as well as support for a wide range of input and output modules, allowing customization to meet the needs of almost any application. In addition to hardware features, PP835 is also equipped with a comprehensive software package that includes a user-friendly programming environment, a wide range of debugging tools, and a series of pre built functional blocks and libraries.
PP835
PLC内的I/O模板，除一般的DI/DO、AD/DA模板外，还发展了一系列特殊功能的I/O模板，这为PLC用于各行各业打开了出路，如用于条形码识别的ASCII/BASIC模板，用于反馈控制的PID模板，用于运行控制、机械加工的高速计数模板、单轴位置控制模板、双轴位置控制模板、凸轮定位器模板、射频识别接口模板等，这在以后还会有很大发展。另外在输入、输出的相关元件、强干扰场合的输入、输出电隔离、地隔离等方面也会更加完善。
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