F7534 HIMA

The system grounding methods include floating grounding,direct grounding and capacitive grounding.For the PLC control system,it is a high-speed low-level control device and should be directly grounded.Due to the influence of the distributed capacitance of the signal cable and the filtering of the input device,the signal exchange frequency between the devices is generally lower than 1MHz,so the grounding wire of the PLC control system adopts one-point grounding and one-point grounding in series.

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。