IEC 61158-3-22 pdf download Industrial communication networks – Fieldbus specifications – Part 3-22: Data-link layer service definition – Type 22 elements 1 1.1 Scope General This part of IEC 61 1 58 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...