描述
PLC的I/O响应时间包括输入电路延迟、输出电路延迟和扫描工作方式引起的时间延迟（一般在2～3个扫描周期）等。对开关量控制的系统，PLC和I/O响应时间一般都能满足实际工程的要求，可不必考虑I/O响应问题。但对模拟量控制的系统、特别是闭环系统就要考虑这个问题。
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