定义了现场总线过程控制用户层的详细信息，用于连续和批量过程控制应用，以及过程工业中典型的顺序和联锁控制应用。适用于其他行业，只要存在类似的应用。为实现所有类型的现场总线设备建立数据通信结构。需要实现现场设备的互操作性和互换性。

Defines the details of the fieldbus process control user layer for continuous and batch process control applications, as well as typical sequential and interlock control applications in the process industries. Usable in other industries wherever similar applications exist. Establishes a data communications structure for implementing all types of fieldbus devices. Required to achieve interoperability and interchangeability of field devices.