Inevitably, when a control panel goes up in flames due to an expensive PCB card being inserted into the wrong socket the call goes out for coding. Unfortunately a coding system for DIN 41612 connectors has not yet been finalised. Importantly such a coding systems should: be independent of connector type; fit all commercially available DIN 41612 connectors; be simply retrofitted and realistically priced; have at least 10 000 coding variations.
Erni has developed coding systems for DIN 41612 types B, C, D, E, H11, M, Q and R connectors. This coding system is bolted or riveted to the connectors and can therefore be fitted at any time eg if coding is required after the initial design. Coding is very simple - coding bars are broken off without the use of tools while a simple tool is available for mass production if desired.
It is important that any coding system does not increase the spacing required between PCB cards beyond the standard 5,08 mm. The Erni coding system with the connector is 15,4 mm for B, C, D, H11, M, Q and R connectors and 20,32 mm for E connectors.
Benefits of Erni coding systems are: independent of connector type; incorrectly inserted coded card withstand a pressure of 250N; space (width) requirements are static; 12780 coding possibilities; suitable for existing types and applications; may be fitted without modifications of connectors, eg drilling of holes; may be retrofitted.
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