Hello, Some co-workers and I have recently started learning Siemens after spending our professional lives in Allen-Bradly world. One thing we cannot wrap our heads around is that in Siemens, the short hand for output is Q. In AB world your inputs and outputs are labeled I and O respectively, but in Siemens world inputs and outputs are I and Q. We asked several more knowledgeable co-workers about this and they had no clue (I guess it never occurred to them). In what language does Output begin with a Q? Was it just a random decision when Siemens was first in development? Thanks.
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