PLC 的扫描过程包含内部处理、通信服务、输入处理、程序执行、输出 处理 五个阶段,这五个阶段扫描一次所需的时间称为扫描周期。
扫描周期与 CPU 运行速度、 PLC 硬件配置和用户程序长短有关。
联系人:王卿
电话:18150117686
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(1) 控制方法上:PLC 采用程序方式实现控制, 容易改变或增加控制要求, 且 PLC 的触点无限;
(2)工作方式上:PLC 采用串行工作方式,提高系统的抗干扰能力;
(3)控制速度上:PLC 的触点实际上是触发器,指令执行的时间在微秒级;
(4) 定时和计数上:PLC 采用半导体集成电路作定时器, 时钟脉冲由晶振提供,延时 精度高,范围宽。PLC 具有继电器系统不具备的计数功能;
(5)可靠性和可维护性上:PLC 采用微电子技术,可靠性高,所具有的自检功能能 及时查出
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