上海6DD1682-0CD0规格

上海6DD1682-0CD0规格

• 开启Put/Get

PLC侧需要设置勾选允许来自远程对象的Put/Get通信访问对于西门子1200/1500系列，要勾选允许Put/Get访问，对于200Smart/300/400，则不需要。

• DB块去除优化访问

对于基于博图开发S7-1200/1500的项目，如果要与DB块数据通信，需要要去除DB的优化的块访问，对于200Smart/300/400，则不需要。如果希望通过标签通信，可以采用OPCUA。

• 务必保证通信地址是有效地址

因为PLC大多数是基于存储区的，每个地址肯定是隶属于某个存储区，大家都知道西门子PLC自带的存储区有I区、Q区、M区、T区、C区，但是对于常用的DB存储区是没有的，需要自己去创建，也就意味着，如果你要读取DB地址，要提前创建好DB存储区，除此以外，DB存储区创建之后，默认是没有字节的，需要自己一个个添加变量，才能形成有效存储区，因此一个DB存储区的范围是有限并且可见的（可以通过偏移量看出来）。

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