1. S7命令分类

• Data Read/Write
• Cyclic Data Read/Write
• Directory info
• System Info
• Blocks move
• PLC Control
• Date and Time
• Security
• Programming

2. S7协议封装

2.1 TPKT 协议和COTP 协议

2.2 COTP Packet

2.2.1 COTP Connection Packet

2.2.2 COTP Fuction Packet

3. PLC内部结构

注：CP(Communication Processor)

4. S7协议部分兼容性列表