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Editable connection point numbers are stored in attributes named KNR1, KNR2, and so on. The sequence for these numbers is often identical to the one of the Running number, but it does not necessarily have to be.

 

 

The KNR sequence is significant for mirror booking, and must be identical between help symbol and mirror symbol for mirror booking to work properly, when the number of connection points is three or greater. If the number of connection points is two, A and B will book even if the order is B and A in the mirror. If the number of connection points is 1, the term sequence has no meaning. That is the case for cable cores, for example.

 

Please note that the KNR sequence should be continuous, meaning with no gaps, and starting with KNR1.

 

Please refer to the View all sub-topic, about how to check.

 

For main symbols, the sequence is more or less a matter of taste, since it primarily affects the presentation. For help symbols it is much more important, since it affects mirror booking, as described above. For make and break help contacts, this is not a deal-breaker, as described above. For change-over contacts, it however is. There, the sequence must be correct, otherwise the booking will not work.

 

The figure and the table below describes the correct KNR sequence for the three connection points of a change-over contact.

 

 

 

Please note, that you can in fact have multiple sequences between the connection points defined in parallel, and that they can differ. The one that is significant for mirror booking, is the sequence for KNR numbers. (The other ones are defined by the Running number, the Connection point number, and the Prompt, giving a total of four possible sequences).