对用户存储容量只能作粗略的估算。在仅对开关量进行控制的系统中，可以用输入总点数乘10字/点+输出总点数乘5字/点来估算;计数器/定时器按(3～5)字/个估算;有运算处理时按(5～10)字/量估算;在有模拟量输入/输出的系统中，可以按每输入/(或输出)一路模拟量约需(80～100)字左右的存储容量来估算;有通信处理时按每个接口200字以上的数量粗略估算。最后，一般按估算容量的50～100%留有裕量。对缺乏经验的设计者，选择容量时留有裕量要大些。
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(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。
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