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可靠性高
PLC的MTBF一般在40000~50000h以上,西门子、ABB、松下等微小型PLC可达10万h以上,而且均有完善的自诊断功能,判断故障迅速,便于维护。
2、模块化组合灵活
可编程控制器是系列化产品,通常采用模块结构来完成不同的任务组合。I/O从8~8192点,有多种机型、多种功能模板可灵活组合,结构形式也是多样的。
3、功能强
PLC应用微电子技术和微计算机,简单型式都具有逻辑、定时、计数等顺序控制功能。基本型式再加上模拟I/O、基本算术运算、通信能力等。复杂型式除了具有基本型式的功能外,还具有扩展的计算能力、多级终端机制、智能I/O、PID调节、过程监视、网络通信能力、远程I/O、多处理器和高速数据处理能力。
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