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1771-ACNR15

沈阳皇姑热电有限公司供暖监控系统如图1所示由三部分组成：现场换热站HOLLiAS-PLCG5控制部分、GPRS数据传输部分、调度室数据中心。通过HOLLiAS-PLCG5CP240RS-232模块完成与GPRSDTU的数据交互。PLC定时将数据发送给GPRSDTU，同时PLC实时接收DTU发来的数据完成相应控制功能。GPRSDTU在收到PLC发来的数据会立即转发到数据中心。根据换热站的实际情况，此次换热站PLC每次向DTU发送帧格式数据量为140字节，包括所有模拟量和开关量。

(1)现场换热站HOLLiAS-PLCG5将各工艺参数实时采集后通过RS-232串口通信模块将数据送往GPRSDTU通信模块；同时，还可通过该通信模块接收调度中心的指令。

(2)GPRS数据传输部分在对GPRSDTU通信模块进行配置时预先输入数据中心的固定IP地址。GPRSDTU通信模块收到HOLLiAS-PLCG5发来的数据后，把这些数据送到前面设置的IP地址主机中（即数据中心路由器）。GPRSDTU发送数据的过程为：数据送到中国移动GPRS网络中，然后再经过Internet，最后在数据中心通过ADSL进行接收，数据中心路由器收到各换热站的数据后转发到数据服务器上。

(3)调度室数据中心由ADSLMODEM、防火墙、路由器、数据中心服务器、客户机、网关机组成。数据中心服务器通过ADSLModem接收来自各换热站的数据，并对数据进行存储、历史趋势分析、报表打印等，其中一部分数据还传送到全厂MIS系统。

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1771-ACNR15

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