3BSC810039R1

3BDH000040R1
EI813F 3BDH000022R1
3BDH000022R1
EI813F
FI840F 3BSH000033R1
3BSH000033R1
FI840F
PM802F
3BSH000002R1

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描述

用户可以用编程器读出RAM中的内容,也可以将用户程序写入RAM,因此RAM又叫读/写存储器。它是易失性的存储器,将它的电源断开后,储存的信息将会丢失。

RAM的工作速度高,价格低,改写方便。为了在关断PLC外部电源后,保存RAM中的用户程序和某些数据(如计数器的计数值),为RAM配备了一个锂电池。现在有的PLC仍用RAM来储存用户程序。

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