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易卖工控网(www.ymgk.com)提供”3HXC0000-152目不转睛”,产品详情:品牌/厂家:ABB、型号:3HXC0000-152、成色:全新、货期:现货 1天内发货、保修:365天,更多产品详情就上易卖工控网。
(3)梯形图程序中的常开、常闭触点不是实际的物理触点。它们只是反映与现场物理开关的状态相对应的输入、输出映像寄存器或数据寄存器中的相应位的状态,在PLC中认为常开触点是对位寄存器状态进行“读取”操作,而常闭触点则是对位寄存器进行“取反”操作。
(4)梯形图程序中的线圈不是实际物理线圈,无法用它来直接驱动现场元件的执行机构。输出线圈中的状态会直接传输到输出映像寄存器的相应位中去,然后用该输出映像寄存器位中的状态“1”(高电平)或“0”(低电平)去控制输出电路中相应电路,并经功率放大之后去控制PLC的输出器件(继电器、晶体管或可控硅),进而使其触点通断来控制外部现场元件的执行机构。
(5)在编制梯形图程序时,PLC内部继电器的触点原则上可以无限次调用,因为存储单元中的位状态可重复读取;而继电接触器控制电路中的继电器触点数是由继电器的结构形式决定,因而也会随着结构形式的确定而固定下来,其数量是有限的。要特别强调的是,在PLC中一般情况下在同一梯形图程序中线圈通常只能调用一次,因此应尽量避免重复使用同一地址编号的线圈(重复线圈会导致输出结果的不确定性)。
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