This paper introduces a control system which has the property of cost-effective multi-channel temperature detection. The system is based on Modbus protocol, taking S7-200PLC as master station and SS7-16RTD type thermal resistance input components as slave station under the master-slave mode for real time temperature data transmission, to achieve the heating system's temperature control and data display. The paper shows the realization of system's software and hardware. The system has been used in a number of practical engineering applications successfully.%介绍了一种高性价比的多路温度检测、控制系统,系统基于Modbus通信协议,以主从方式实现西门子S7-200PLC主站与SS7-16RTD型热电阻输入组件从站的实时温度数据传输,完成加热系统的温度控制和数据显示.文中给出了系统软、硬件实现方法,该系统已在多个实际工程中成功应用.
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