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<< Click to Display Table of Contents >> Multiple level item designations |
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A complete support for multiple level item designations is included in cadett ELSA.
Figure 369: The "Multiple level item designations" section
Multiple levels are supported for function (plant), location, and product (circuit). The IEC standard (old and new) defines three different ways of denoting levels of the same aspect.
A location +A1 with a sub-level +B1, and under that yet another sub-level called +C1, can therefore be written as +A1+B1+C1. An alternative is to divide the levels with dots, which gives the result +A1.B1.C1. A third option is to omit separator characters between levels all together. The result of that would be +A1B1C1. This third option is the most limited one, since all location designations are required to consist of a combination of letters and digits with the letters first and the digits last, to be able to distinguish the levels.
To sum up, the possible ways of denoting levels are:
•+A1+B1+C1
•+A1.B1.C1
•+A1B1C1
The same thing is also true for function (plant) and product (circuit). cadett ELSA supports all three methods.
Note
The first way of separating leves, where the separator character for the aspect in question is simply repeated, is nowadays regarded as the preferred method.
The difference if multiple level item designations is activated or not is shown in the cases where boundary boxes are used and especially if several boundary boxes which states the same aspect , for instance function (plant), are placed inside one another.
•If Multiple level item designations is inactivated, the innermost boundary box will have priority and therefore decide function (plant) or location symbols within the box.
•If Multiple level item designations is activated, function (plant), location, and product (circuit) designations from the drawing frame and inwards are added to one another. The designations that are specified in the frame (normally in the upper left corner)will constitute the top level, and the boundary boxes will specify sub-levels of that.
Please note!
If you use multiple level item designations and a designation in a boundary box does not refer to a sub-level, but instead a designation on the top level, in parallel with the designation in the title field, that fact must be specified specially. The way of doing that - according to IEC1346 - is with the character > (greater than) in the beginning. Using < (less than) is also supported by cadett ELSA but not by the IEC standard.
An example that might clarify the explanation that was given above is found in a separate sub-topic named Example of multiple level designations.
The complete item designations are added according to the settings that are made in the no less than five sub-sections of this section. These sub-sections are listed below, with links to the corresponding sub-topics.
•Separator character between levels
•Separator character for top level in item designations