Calculators
Build a reference designation to IEC 81346
Labelling is what plant documentation stands or falls on in the long run. Anyone looking for a component ten years later finds it through the designation or not at all. This builder shows the structure and the common letter codes.
Result
- Complete reference designation
- —
- Meaning of the letter code
- —
- Structure
- —
Please fill all fields with valid numbers.
- Opens the print dialog. Choose “Save as PDF” as the destination.
- Opens your email program with the values from this calculation. Nothing is sent to us until you send it yourself.
A guide, not a design to standard. We give no warranty for the correctness of the results. The applicable standards and case-by-case verification govern.
The grey values are an example. Simply enter your own.
Matching services
Calculating is the easy part.
A formula gives you a number. Designing a plant also demands installation method, grouping, discrimination, the standards in force and a look at the installed base. That is what we take on.
More about this calculator
Worked example
The default case the calculator starts with, worked through once. Change the values above and it recalculates immediately.
Inputs
- Function (=)
- A1
- Location (+)
- S1
- Letter code (−)
- QA
- Sequential number
- 12
Result
- Complete reference designation
- =A1+S1-QA12
- Meaning of the letter code
- QA, Switching current, for example contactor, circuit breaker, motor protection switch
- Structure
- = function · + location · − component with letter code and number · : terminal
Formula · Assumptions and standards
Formula
- =Function +Location −Component :Terminal
- For example =A1+S1-QA12:13
- = functional assignment · + mounting location · − product · : terminal
Assumptions and standards
- Letter codes to IEC 81346-2 (formerly EN 61346-2 and before that DIN 40719).
- The prefixes are standardised, the numbering behind them is not. It follows the operator’s system. That is exactly why an agreed system matters so much.
- Letter codes can be entered freely, including your own or older ones to the 2009 edition. The builder shows the meaning for the main classes and common subclasses of the 2019 edition, all classes are in the letter code finder.
Frequently asked
Reference designation
You have a technical task? We will look at how it can be solved.
Discuss a projectWhat is the difference between = and +?
The equals sign describes function, what a component belongs to. The plus sign describes location, where it is installed. A contactor can belong functionally to the conveyor line (=F1) while sitting in control cabinet 2 (+S2).
Do I have to use every level?
No. In small installations the product level alone (−Q12) is often enough. As soon as there are several cabinets or plant sections, adding location and function quickly becomes indispensable.
We have our own grown system. Should we switch?
Usually not. A consistently applied in-house system beats a half-converted installed base. In projects we continue existing systems rather than replacing them. A break in the documentation costs more than the standard gains.
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