EN 61987-21:2016 工业过程测量和控制 过程设备目录中的数据结构和元素 第21部分：用于电子数据交换的自动阀的属性列表（LOP） 通用结构
Industrial-process measurement and control - Data structures and elements in process equipment catalogues - Part 21: List of Properties (LOP) of automated valves for electronic data exchange - Generic structures
IEC 61987-21:2015 provides a characterization for the integration of automated valves, including control valves, automated on/off-valves and process regulators, in the Common Data ...