As a lifting machine, the guide rail elevator can transport materials and personnel, but due to serious interference, it can not ensure the safe operation of the lifting platform. In order to solve this problem, the automatic leveling controller can be set on the guide rail elevator, but there are still strong interference sources. How to resist interference?

液位控制器主要由单片机作为核心部件，通过固态继电器控制交流接触器，进而控制三相交流电动机。由于交流接触器和交流电动机是强干扰源，解决这一部分的干扰是关键。我们采取的措施主要分为两个方面，一是硬件抗干扰措施，二是软件抗干扰措施。

The liquid level controller is mainly composed of a single chip microcomputer as the core component, which controls the AC contactor through the solid-state relay, and then controls the three-phase AC motor. As AC contactor and AC motor are strong interference sources, the key is to solve this part of interference. The measures we have taken are mainly divided into two aspects: hardware anti-interference measures and software anti-interference measures.

为了提高升降平台调平控制系统的可靠性，输出端采用光电隔离技术等具有保护和抗干扰双重功能的隔离技术，为主控系统提供两部分光电隔离。同时，还可以找到提高信号传输容量的方法，达到抗共模干扰的目的。

In order to improve the reliability of the leveling control system of the lifting platform, the output terminal adopts photoelectric isolation technology and other isolation technologies with dual functions of safety protection and anti-interference, providing two parts of photoelectric isolation for the main control system. At the same time, we can also find ways to improve the signal transmission capacity to achieve the purpose of anti common mode interference.

除了在控制器硬件上采取相应的屏蔽措施外，在软件上也采取了相应的抗干扰措施，包括指令冗余、定时器设置、手动复位等，大大提高了系统的可靠性，保证了升降平台的运行。

In addition to the corresponding shielding measures on the controller hardware, the corresponding anti-interference measures are also taken on the software, including command redundancy, timer setting, manual reset, etc., which greatly improves the reliability of the system and ensures the safe operation of the lifting platform.

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