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针对大量开关量信号输入的问题,以日本三菱公司的fx系列plc为例,本文设计了一种基于组扫描输入的plc开关量采集方法,借助于输入接口板,可以实现多个开关输入信号接入plc单个输入点,使用这种方法,对输入点数较多的控制系统,可以节省plc的输入点数,提高plc的信息采集效率效率,对降低控制系统成本具有重要意义。
硬件设计
对于工业现场中经常会用到的开关、按钮等开关量信号,通常按照图1的配线方法接入plc的输入点,该方法以com端作为所有开关量输入信号的公共端,每一个开关或按钮接入一个plc的输入点。
为解决大量开关量信号输入问题,利用信号扫描原理,设计了一种基于组扫描输入的plc开关量输入采集方法,硬件结构如图2所示。图中以16个开关量输入信号为例,这16个开关量输入信号被分为4组,分别接入四块接口板(每块接口板可接入4路信号,通过二极管输出)。通过接口板后,k1、k5、k9、k13均接入plc的x1输入端,依此类推,k2、k6、k10、k14均接入plc的x2输入端,k3、k7、k11、k15均接入plc的x3输入端,k4、k8、k12、k16均接入plc的x4输入端,16个开关量输入信号只占用了plc的4个输入端。
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