IEC 61158的这一部分为自动化环境中设备之间的基本时间关键型消息通信提供了通用元素。术语“时间关键型”用于表示存在一个时间窗口，在该时间窗口内，一个或多个指定动作需要以某种确定的水平完成。如果未能在时间窗口内完成指定的操作，则可能会导致请求操作的应用程序失败，并对设备、工厂以及可能的人身安全造成风险。交叉引用:IEEE标准802.1ISO/IEC 10731ISO/IEC 7498-1ISO/IEC 7498-3ISO/IEC/IEEE 8802-3IEC 61158-4-12IEEE标准802。 1QIEC 61158-5-12ISO/IEC TR 8802-1IEC 61158-6-12IETF RFC 768IEC 61588IEC 61158-1IEC 61784-2IETF RFC 791IEC 61784-1IEC 61158-2:2014取代BS EN 61158-3-12:2014，该标准仍然有效。购买本文件时，包括所有当前可用的修改件。

This part of IEC 61158 provides common elements for basic time-critical messaging communications between devices in an automation environment. The term "time-critical" is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life.Cross References:IEEE Std 802.1DISO/IEC 10731ISO/IEC 7498-1ISO/IEC 7498-3ISO/IEC/IEEE 8802-3IEC 61158-4-12IEEE Std 802.1QIEC 61158-5-12ISO/IEC TR 8802-1IEC 61158-6-12IETF RFC 768IEC 61588IEC 61158-1IEC 61784-2IETF RFC 791IEC 61784-1IEC 61158-2:2014Replaces BS EN 61158-3-12:2014 which remains currentAll current amendments available at time of purchase are included with the purchase of this document.