明白PLC控制的信号有那些 PLC是根据输入条件来控制输出信号的。输入信号就是控制台上的按钮，机床上的限位开关，压力继电器和光电开关等各类传感器，而输出点则控制继电器或接触器线圈的通断，指示灯的明灭，液压阀电磁铁的吸合及变频器的信号端子的输出。在做一个机床设计时我们经常会碰到两个问题，一个是PLC可扩展的I/O点数是有限的，另一个是增加I/O点数是要增加成本的。所以我们要知道控制的信号有那些，各是多少，统计出需要多少输入和输出点，据此选出PLC。Shipping not specified
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SERVICE Siemens 6DD1601-0AE0 [12 MONTHS WARRANTY]

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SERVICE Siemens 6AV6643-0DB01-1AX5 [12 MONTHS WARRANTY]

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SERVICE Siemens 6ES7614-1AH00-0AB3 [12 MONTHS WARRANTY]

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SERVICE Siemens 6SC6110-0GA01 [12 MONTHS WARRANTY]

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SERVICE Siemens 6AG1315-2FH13-2AB0 [12 MONTHS WARRANTY]

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