S7—300与CS-3000系统通讯的实现

Realization of S7 -300 and CS -3000 System Communication

本文阐述了由西门子S7—300PLC构成的（201循环气压缩机系统与横河的DCSCS3000系统进行通讯的方法，详细说明了以DCS系统为主站，通过使用MODBUS协议和RS485接口通讯对C201联锁控制系统进行监视的步骤，和PLC、DCS系统的参数设置时的注意事项，以及在调试中遇到的问题和解决方法。

This paper expounds the communication method for C201 circulating gas compressor com- posed of Siemens S7 - 300 PLC system along with Henghe DCS CS3000 system. It gives a detailed de- scription of the monitoring procedures to C201 interlocking control system by taking DCS system as the main station, and using MODBUS protocol and RS485 interface communication; it also gives the needing attention in parameter setting of PLC and DCS systems, the problems and solutions which are encountered in testing.