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(4)模拟变量变换模块
硬件设备中的模拟量能以浮点数或整数的形式读出,但这些值有可能只是数据量程范围内的一个相对值,需要经过某种形式的变换才能转换为有实际意义的物理值。
(5)数据点在线监视模块
OPC Server可以在线监视现场设备的数据,并支持对现场设备的数据读写操作。在线监视时,OPC的添加、删除服务器对象、组对象、项对象的操作被禁止。
3.1.1.6 现场数据获取
通过北斗链路获取现场数据、现场设备满足MODBUS访问、通过配置文件完成不同资源的监测等级,不同监测等级数据可按照不同频度进行更新。
下行控制的状态参数及数据返回优先级高于正常数据上传,保证下行控制的及时有效。
现场数据类型分为DI/DO/AI/AO四种类型可选,每种类型可配置大数量200个。具体的通信指令设置如下:
按照大站点数据量计算,完全更新一次有效数据需要更新428Bytes数据,即通过12条报文完成数据的更新,终端数据完全更新周期约为13min。数据查询指令中不同资源可设置不同监测等级,不同监测等级不同的更新频率。当终端数据更新采用不同监测等级查询时,高优先级数据更新周期缩短,低优先级数据更新周期相应延长。
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