The contact recesses of the initial element and module element(s) are marked with numbers 1 through 5.
To guarantee perfect arrangement of the different contacts the CEB wiring diagram shows plug group letters which are followed by additional numbers, showing whether the single contact can be found In the initial element or a module element.
Number 1 after a letter always means an initial element.
Number 2 means the first module element, and so on.
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