S7-300CPU必须安装MMC才能运行吗，如果没有MMC卡是不是什么功能都不能实现

答案

你的理解完全正确，确切地讲，新型的S7-300CPU必须安装MMC才能运行，这种CPU已问世多年了。那种老的CPU（不需MMC的）已很难见到了。现样本中的S7-300CPU均必须配置MMC，否则不能运行。

MODBUS V3.1   型号 6ES78701AA010YA0   的结构和用途是什么啊

答案

1、SIMATIC S7，MODBUS MASTER V3.1，1个安装软件，单一授权，软件和文档光盘， HW-DONGLE。
这是包括MODBUS主站驱动软件及授权（硬狗），当S7-300做主站时需要配置 CP341模块，还需购买上述的MODBUS驱动软件（包括授权即硬狗）

当把硬件组态下载至CPU中的时候，有没有办法清空这个组态信息呢？使之变成一个出厂时的没有任何程序块以及硬件组态的信息？
在STEP7编程软件下该进行什么操作方可删除硬件组态？

答案

在Step7中选择View--Online，选择Blocks中所有的块（包括System Data），Delete，确认即可。
或使用西门子编程器PG或专用的读卡器（不是市面上普通的读卡器）删除或格式化MMC卡。

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