应用程序通常是在CPU的有备用电池供电的RAM存储器中开发，并且由RAM存储器加以执行，如果希望满足程序的完整性或PLC无需电池而工作，那么一种任选的 EEPROM或EPROM可以装于嵌入式CPU基板空插座(标记位PROGRAM PROM)内，或装于CPU 331模块(并且CPU341中的硬件

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