| 产品特性：进口*** | 是否进口：否 | 加工定制：否 |
| 品牌：ABB | 型号：NINT-72C | 工作电压：24VDCV |
| 输出频率：50kHz | 产品认证：UL | 系列：ABB |
| 物料编码：NINT-72C | 运输：快递物流 | 时效：3天- |
| 快递费用：包邮顺丰 | 订货号：NINT-72C | 包装方式：普通包装 |
NINT-72C输出模块
NINT-72C输出模块
NINT-72C输出模块
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，***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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