ProFiBus现场总线在空调参数测试系统上的应用

在分析ProFiBus现场总线技术的基础上,设计了基于ProFiBus-DP现场总线的空调参数测试系统.该系统由23台车构成的环形测试线和设备控制层、集中监控层、综合管理层3层控制结构ProFiBus总线网络组成,通过台车上的S7-200 PLC(CPU224)完成对空调的启动电流、制冷模式参数、制热模式参数测试.其综合管理层采用研华825工作站,网络主站使用S7-300 PLC(CPU315-2DP),网络从站使用S7-200PLC+EM277.主站和从站采用ProFiBus-DP协议,通过屏蔽双绞线完成通信.主站和管理主机以微波方式实现通信.

Application of ProFiBus in the Testing System for Parameter of Air-Conditioner

Based on ananlysing the ProFibus Field Bus technique, the testing system for parameter of air-conditioner based on ProFiBus-DP is designed. The system consists of a circle testing line that includes 23 trolleies, and the ProFiBus network that includes 3 layers: device controling layer, concentrate observing and controlling layer, synthesis management layer. The Startup current of air-conditioner, parameters of Cooling mode and Heating mode are tested by S7-200 PLC (CP U224) on the trolleys. 825 workstation is used in the synthesis management layer, S7-300 PLC (CPU315-2DP) is used in the network master station, S7-200 PLC + EM277 is used in the network associate station. The communicating protocol between the network master station and the network associate station is ProFiBus-DP standard protocol, the communication is implemented through the twisted-pair. The communication between the synthesis managing station and the network master station is implemented with microwave mode.