描述
PLC的扫描工作方式引起的延迟可达2-3个扫描周期。对于大多数应用场合来说,PLC的响应速度都可以满足要求,不是主要问题。然而对于某些个别场合,则要求考虑PLC的响应速度。为了减少PLC的I/O响应的延迟时间,可以选用扫描速度高的PLC,或选用具有高速I/O处理功能指令的PLC,或选用具有快速响应模块和中断输入模块的PLC等。
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