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.
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?
Share this post Link to post Share on other sites. Q doesn't look like a zero. Hello, Concur with Q does not look like zero. Siemens is not the only entity using Q in place of 'O'. In electronics, Q is very common. Well an I looks like a 1. That does not sound like a reasonable explanation. After doing some more research I discovered that as well. I'm still very curious as to the explanation behind Q being used to symbolize Output.
As I stated above, an I looks like a 1 so why do they still use I for input? Not to try and confuse the question however the I and Q were for the english speaking countries.. The german is E for inputs and A for outputs. Rod Edited 15 Dec by Rodney.
Hi, While I uppercase I and 1 look alike it is closer to l lower case L on older systems. I suspect there is a connection with abstract Finite-State Machines from theoretical computer science, where "state" is often noted Q as well so I asked them too Alan Turing used the letter q to denote states in what came to be known as Turing machines. Presumably the q stood for quanta, emphasizing a state's discrete rather than continuous nature.
Computer research corp. Column 13 lines 1 and 2 talks to a "1" and a "0" for logical states. Using carry etc. Column 8 lines 56 ff talks to again logic levels as "1' and "0". There were lots of later ones in IC's etc. It is very clear that the terminology predates IC's. The "1" and "0" notation almost certainly comes from earlier work, I would conjecture the work of Boole might reference that. I only followed one thread through this. Not a definitive answer, but the first flipflops had two inputs, to Set and Reset them respectively; another early type had a single Toggle input.
That conveniently allocated the letters R,S,T for input signals, so I guess the choice was between Q and U for the output! Kleene Used q Previous works related with finite states machines, are based on brain behaviour so the theory of "status quo" is reforced. Maybe Q is used because it looks similar to 'O' for O utput but it cannot be confused with digit 0 Zero. I was under the impression it had to do with the q-point quiescent point of a transistor, and that Q started referring to all transistor based components somehow.
Because simply if output is designated by O , and output of the flipflop is 0, then it would get confusing , that's why. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Or to put it another way, a chicken is an egg's way of reproducing itself. Quelle would refer to source code or a source file. I think Monkeyhead is the closest, although it probably also had something to do with the fact that the address O0.
I think it is a very good idea because my dang secretary type to miny tipos. I have found the enema and it is me. Dan Bentler. The first answer was exactly correct: to avoid confusion between O and 0. On a similar note, anyone who studied electrical engineering would remember that letter 'j' is used for the imaginary unity i. The reason: not to confuse with a standard designation for electrical current.
The use of Q for outputs on the GE platform goes way back. I suspect the Siemens usage does too. Us really old farts recall the days when drawings were made and lettered by hand.
Everything was upper case.
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