描述
为了保证程序及重要参数的安全，一般小型PLC设有外接EEPROM卡盒接口，通过该接口可以将卡盒的内容写入PLC，也可将PLC内的程序及重要参数传到外接EEPROM卡盒内作为备份。程序存储卡EEPROM有6ES7291-8GC00-0A0和6ES7291-8GD00-0A0两种，程序容量分别为8K和16K程序步。
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