根据EM277上的拨位开关设定以上EM277从站的站地址.
组态完系统的硬件配置后，将硬件信息下载到s7-300的PLC当中.S7-300的硬件下载完成后，将EM277的拨位开关拨到与以上硬件组态的设定值一致，在S7- 200中编写程序将进行交换的数据存放在VB0 — VB15，对应S7-300的PQB0-PQB7和PIB0- PIB7，打开STEP7中的变量表和STEP7 MicroWin32的状态表进行监控.
注意：EM277上拨位开关的位置一定要和S7 — 300中组态的地址值一致。
3.S7-200和S7-300进行以太网通信
Set the station address of the above EM277 slave station according to the dial switch on EM277
After configuring the hardware configuration of the system, download the hardware information to the S7-300 PLC After the hardware download of S7-300 is completed, turn the dial switch of EM277 to be consistent with the set value of the above hardware configuration, write a program in S7-200, store the exchanged data in vb0-vb15, corresponding to pqb0-pqb7 and pib0- pib7 of S7-300, and open the variable table in STEP7 and the status table of STEP7 microwin32 for monitoring
Note: the position of the dip switch on EM277 must be consistent with the address value configured in S7-300.
3. Ethernet communication between S7-200 and S7-300
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