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以美国BB(Bristol Babcock)公司的RTU系统(Remote Terminal Unit,远程终端设备,简称RTU)和西门子S7系统通信为例,介绍了Modbus协议的特点和应用过程,介绍了RTU与Siemens PLC(西门子可编程逻辑控制器)之间Modbus通信的实现。对美国BB RTU与Siemens PLC之间Modbus通信两系统硬件设置、软件组态以及调试方面作了较为详细的介绍。该系统已投入运行后,稳定可靠,具有良好的应用和推广价值。
Taking the Bristol Babcock company’s RTU system (Remote Terminal Unit, RTU for short) and Siemens S7 system as an example, this paper introduces the characteristics and application process of Modbus protocol, introduces the RTU and Siemens PLC (Siemens Programming Logic Controller) between the realization of Modbus communication. On the United States BB RTU and Siemens PLC Modbus communication between the two systems hardware settings, software configuration and debugging made a more detailed description. The system has been put into operation, stable and reliable, with good application and promotion value.