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In many cases, terminal numbers are used to assign wire-numbers to wires to and from terminals. This way of numbering has old traditions and is still used in many places, even if it is neither encouraged, nor discouraged by current standards. In cadett ELSA there is full support for assigning wire-numbers of this type automatically.

 

If this is to be done, however, it is a requirement that all terminals have numbers. Otherwise there is nothing to base the  wire-numbers on. Therefore, if the terminal number is missing in some terminals, the wire-numbering will encounter problems under normal circumstances.

 

What really happens then, is that Dynamic OnLine I cannot perform a complete wire-numbering. If you try to wire-number in such a situation, you will get an error message which refers to the first unnumbered terminal that was encountered.

 

 

You will then first have to make sure that all terminals have numbers, before you can continue with the wire-numbering.

 

This can of course be both good and bad depending on the way you have chosen to number the objects in your project. You perhaps want to have terminals without numbers. In that case, this feature is of course not good at all. Even in other situations, it might be suitable to skip this check.

 

It is therefore possible to turn this check off. In that case, if you still have terminals without terminal numbers, a wire-numbering will be done anyway, for good and for bad. The consequence will be that if you use terminal numbers as wire-numbers to terminals, and terminals without terminal numbers exist, you will get empty wire-numbers in your project. As a result of that, you will have wire-number symbols with empty wire-numbers. These are errors in cadett ELSA and error messages about them will appear in the OnLine Protocol.

 

A way to avoid this problem is to number wires to terminals using a numbering series instead of with terminal numbers. That may be a good solution if you, for some reason, use unnumbered terminals. Another solution, of course, is not to use unnumbered terminals.