目前国内 SIS 系统中数据库主要采用的 Historian、PI 等。 利用 Historian 并结合iFIX 不但可以在技术上满足SIS系统 对实时性的要求,而且具有很强的实时数据处理压缩保存 能力,同时Historian支持各类控制系统下的现场数据和硬 件设备。SIS 系统是一种实时性很高的强实时监视系统, Historian快速高效的数据处理、大量的数据点的存储以及 高压缩格式的数据保存使得 Historian 数据库在SIS系统中 发挥了重大作用。利用 Historian数据库的开放性及分布式 网络平台可以很快的进行 SIS 系统的升级和扩充,充分利 用了软件复用的思想,可减少大量的开发和维护工作。在各流程图上直观的显示设备流程图、各设备的状态及各 节点的数据(如上页图 6所示)。系统的各点的状态都可在 这里进行监视,流程图将非常直观的显示各子系统的运行 状况。对实时及历史数据库中所记录的模拟量数据及开关量数据 都可以曲线的形式显示出来,以供参考和分析(图8)。可通过选择定义一定时间段和下拉菜单选择不同的数据点, 可在曲线图中以多种方式显示出在
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