产品参数 |
品牌 | AB |
产品特性 | 进口*** |
是否进口 | 否 |
加工定制 | 否 |
工作电压 | 24VDCV |
输出频率 | 50kHz |
产品认证 | UL |
系列 | 1746 1756 |
物料编码 | 1788-EN2DN |
运输 | 快递物流 |
时效 | 3天- |
快递费用 | 包邮顺丰 |
订货号 | 1788-EN2DN |
包装方式 | 普通包装 |
可售卖地 | 全国 |
型号 | 1788-EN2DN | |
1788-EN2DN输入模块
1788-EN2DN输入模块
PLC是按什么样的工作方式进行工作的?它的中心工作过程分哪几个阶段?在每个阶段主要完成哪些控制任务?
下面来回答这个问题:
PLC是按集中输入、集中输出,周期性循环扫描的方式进行工作的。它的中心工作过程分输入采样阶段、程序执行阶段、输出刷新阶段。
在输入采样阶段,首先扫描所以输入端子,并将各输入状态存入相对应的输入映像寄存器中,此时输入映像寄存器被刷新,它与外界隔离,其内容保持不变,直到下一个扫描周期的输入采样阶段。
在程序执行阶段,PLC按从左到右、从上到下的步骤顺序执行程序。
在输出刷新阶段中,元件映像寄存器中所有输出继电器的状态一起转存到输出锁存器中,通过一定方式集中输出, 后经过输出端子驱动外部负责,在下一个输出刷新阶段开始之前,输出锁存器的状态不会改变。
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