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工业控制系统中的一个很重要的指标就是可靠性,而来自各方面的干扰都会影响其可靠性 这些问题解决得不好,就会导致系统工作不稳定、误操作,甚至“死机” 因此分析干扰的来源找到解决办法就成了保证其可靠性的关键1系统工作环境 浮选工艺参数测控系统安装在选煤厂的浮选车间内 浮选车间环境恶劣,电动机群同时启动,同时关闭,这就使得电网电压随着电动机群的启动和关闭而发生跳变,同时又产生强电磁场辐射;浮选设备需要轮回维修,而每次维修都要进行电焊;浮选设备工作时震动很大,车间内到处都漂浮着带有油污的灰尘,因此微机测控系统必须距测控现场有一定的地离,这就使得干扰更容易进入微机系统,增加了系统抗干扰的难度2干扰源及干扰耦合通道的分析
A very important indicator of industrial control system is reliability, and interference from all aspects will affect its reliability. These problems can not be solved properly, it will lead to instability of the system, misoperation, or even “crash” analysis of interference The source to find a solution to become the key to ensure its reliability 1 System work environment Flotation process parameters Measurement and Control System Installed in the flotation plant in the coal preparation plant flotation plant environment is poor, the motor group starts at the same time, while the closure, which Making the grid voltage jump with the start and stop of the motor group, while generating strong electromagnetic radiation; flotation equipment needs reincarnation maintenance, and each repair should be welding; flotation equipment vibration during work, the workshop Therefore, the monitoring and control system of the microcomputer must have a certain distance from the monitoring and control site, which makes the interference easier to enter the computer system and increases the difficulty of system anti-interference. 2 Analysis of Interference Sources and Interference Coupling Passages