It often uses hierarchical coding, such as =F1+L1-K1, where: = indicates the Functional Aspect + indicates the Location Aspect - indicates the Product Aspect
Even with an in hand, engineers frequently break the rules.
Understanding IEC 61346-1: The Foundation of Industrial Reference Designation Systems
Under the rules established in IEC 61346-1 (and carried forward into 81346), a reference designation consists of specific prefix signs followed by letters and numbers. Common Prefix Signs = denotes the function aspect. + denotes the location aspect. - denotes the product aspect. Structuring Example Consider an industrial mixing tank system: =A1 might represent the mixing function of the plant. +C1 might represent the main control cabinet room. -K1 might represent a specific control relay. iec 61346-1 pdf
Both major CAE software packages use the structure as their default project tree. In EPLAN, the "Functional" and "Location" properties map directly to the = and + prefixes from the standard.
IEC 61346-1 applies to SIS that are used to achieve or maintain a safe state of a process. The standard defines key concepts, including:
IEC 61346-1 defined specific single-letter codes to classify objects based on their intended purpose. While these were expanded in the newer IEC 81346-2 standard, the basic classes remain highly recognizable in the field: It often uses hierarchical coding, such as =F1+L1-K1,
For instance, the series now includes , showing how the framework is being adapted to the specific needs of different industries. Whether you are an engineer, a technical writer, or a project manager, adopting the latest version of the standard ensures that your documentation practices are aligned with current international best practices.
solves this by introducing object-oriented structuring . The standard provides rules for breaking down any technical system into manageable, reusable objects and assigning them reference designations that remain consistent across all disciplines (mechanical, electrical, software, etc.).
Engineers looking for an "IEC 61346-1 PDF" should be aware of its current status: Withdrawn and replaced. + denotes the location aspect
To prevent conflicting naming conventions among electrical, mechanical, and structural software tools, the standard dictates that any object can be viewed from three fundamental . The Three Structural Aspects
Be extremely cautious of websites offering free PDF downloads of copyrighted standards. These are often illegal copies that may contain errors, be outdated, or pose a cybersecurity risk to your computer. The safest and most ethical path is to purchase a genuine copy or, if applicable, access it through your organization's subscription to a standards service.