what does the M on Siemens I/O stand for?

rob63

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R
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Mar 2015
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uk
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On the Siemens s7300 I/O there is a schematic on the the inside of the cover, what does the M stand for?
 
In German, the common or reference potential connection is called Masse, pronounced Mossa (with a short o in american english).
 

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