1760-LDFC

1760-LDFC

1760-LDFC

1760-LDFC

（ 3 ）对 I/O 响应时间的选择

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。

（ 4 ）根据输出负载的特点选型

不同的负载对 PLC 的输出方式有相应的要求。例如，频繁通断的***负载，应选择晶体管或晶闸管输出型的，而不应选用继电器输出型的。但继电器输出型的 PLC 有许多优点，如导通压降小，有隔离作用，价格相对较便宜，承受瞬时过电压和过电流的能力较强，其负载电压灵活（可交流、可直流）且电压等级范围大等。所以动作不频繁的交、直流负载可以选择继电器输出型的 PLC 。

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