CONVERSION INTO DECIMAL

[MIKE31 0]

HI What instruction is used to convert from bcd , binary or hexa decimal into decimal Thanks

[ParaffinPower 13]

Hey Mike Binary to BCD - BCD BCD-Binary - BIN As for converting hex and binary to decimal: Essentially they are a different representation of the same thing i.e you can't convert as such, but you can choose how they're represented. BCD is a different numbering system, whereas hex, bin, dec are different representations of the same thing. Hex - A Dec - 10 Bin - 1010 BCD - 0001 0000 (decimal 10) Make any sense? Pp Edited 4 Feb 2007 by ParaffinPower

[JRoss 84]

That's an inexact way to explain the different numbering systems. In the PLC world it may be good enough, but you're much better off if you really understand the numbering systems. Binary, decimal, and hexadecimal are all different numbering systems. But, they're all stored in the PLC the same way, as binary. You can change how you see the numbers, but they're always stored in binary. BCD, on the other hand is not a numbering system at all, but a way to represent the decimal system using binary. It was used more commonly in the past to interact between a binary computer system and a decimal human world, back when HMIs were seven segment displays and thumbwheels. BCD isn't used as much since the advent of OITs. So there are only instructions in a PLC for converting between binary and BCD. Everything else is stuck in binary and that won't change.

[BobB 58]

If you place your DM in the symbol table and give them a name you can define the type for that word. If you chosse the wrong type for an instruction it will not display properly.

[IO_Rack 181]

That's cheating!

[BobB 58]

Depends on how much of a masochist you are to yourself I guess. One could consider using the conversions program and Windows calculator as cheating also instead of having to work it all out on paper or with a slide rule - anyone remember them?

[Sleepy Wombat 27]

Although it might be cheating.. it will not always solve the problem when a screen requires BCD etc... Slide rule... yeh i remember them Bob... on old tv progs and museums.... You would remember the Abacus wouldnt' you mate...

[BobB 58]

Yep! Worry beads too.

[IO_Rack 181]

I was joking of course. Although, I believe it is rudimentary in understanding the difference between the data types you are working with and the types you are seeing. I know that you understand them Bob. As for the original poster and anyone else interested, I would suggest reading Jay's Omron Tip #49.