现代工业生产是复杂多样的，它们对控制的要求也各不相同。可编程序控制器一经出现就受到了广大工程技术人员的欢迎。它的主要特点如下：
（1）抗干扰能力强，可靠性高
微机虽然具有很强的功能，但抗干扰能力差，工业现场的电磁干扰，电源波动，机械振动，温度和湿度的变化，都可以使一般通用微机不能正常工作。而PLC在电子线路、机械结构以及软件结构上都吸取生产厂家长期积累的工业控制经验，主要模块均采用大规模与**大规模集成电路，I／0系统设计有完善的通道保护与信号调理电路；在结构上对耐热、防潮、防尘、抗震等都有精确考虑；在硬件上采用隔离、屏蔽、滤波、接地等抗干扰措施；在软件上采用数字滤波等抗干扰和故障诊断措施；所有这些使PLC具有较高的抗干扰能力。PLC的平均无故障时间通常在几万小时以上，这是一般微机不能比拟的。
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