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Numbers, Codes and a Little LogicAt the heart of any computer system are the numbering systems and digital codes used for instructions and memory storage. Besides the ones and zeros it is important to understand how these bits are packaged into codes like BCD and Gray codes. Understanding these concepts enables the programmer to manipulate the PLC at it's most basic level. Don't you want to feel the power at your fingertips!? Now for the most part these types of concepts will be transparent when programming but there will be occasions when you'll be glad you read this.
 When the cavemen first started counting they sat around looking at their fingers and stopped at ten. It took man a little longer to figure out the concept of zero but nobody is perfect. So we've ended up with a common way of counting by 10's which in tech jargon is refered to as base-10 or radix-10. Base or radix refers to the number of symbols you have available to count. We'll see that computers make it more difficult for us lazy humans because they like to count by base-2 (binary). In a compromise with computers us humans have developed the base-8 (octal) or base-16 (hexadecimal) systems.
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Hi
I am a student of D.A.E (Electronics)and i intrest your site Thank you very much.
it is very helpful site of Plc subject to us
Hi. Tip is Mansoor. I
Hi. Tip is Mansoor. I completed diploma in instrumentation and am doing a training course in Automation(plc,scada,dcs..). This is very very much useful to me to get the updated info and to get boosting up my little knowledge:) thanx:-).
hi mansoor
himansoor my name is fayaz and im intrested to learn plc,Dcs,scada. where u r training u r course...plz help meand mail me........my mail id is [email protected] bye
Help
Hi,
I Want to establish the Automatic Meter Reading Systems. I will be very happy if any body help to setup, installation, configuration and design of PLC, Modem & software design.
Moniuzzaman
Asi@ Systems
Dhaka
Thank for all comment this
Thank for all comment this site is helpful.
hamaye kasani ke dar enja hastand ke hamvatanand.
che jaleb biad bishtar be ham komak konim.
Best Presentation on PLC
Dear Sir,
I have seen the PLC tutorial on your site , its the best Tutorial i have ever seen .
Thanks for giving us such an effective Presentation .
Regards
Chinmay Sahasrabudhe .
Who invented Zero (0)?
Aryabhata, Inventor of the Digit Zero.
Aryabhata is the first of the great astronomers of the classical age of India. He was born in 476 AD in Ashmaka but later lived in Kusumapura, which his commentator Bhaskara I (629 AD) identifies with Patilputra (modern Patna).
Aryabhata gave the world the digit "0" (zero) for which he became immortal.
"Inventor of Zero"
No Dear, Inventors of "0" (zero), in its both forms, the arabic one (.) and the other one (0), were first the phenicians (lived on the eastern cost of the Mediterranean Sea, in Byblos, Sidon, Jubail & Beirut, which are lebanese cities; arabs), who invented the alphabets as well. You can refer to the book "The Complete Handbook Of Modern Receivers And Transceivers", Mc Graw Hill, USA. It states " ... In a way or another, the computer invention is refered to the arabs due to the fact that the computer's programming is done on the base of zeros and ones (0,1) solely.
Great Site
Thanks for that great introduction & information. It is a pleasure reading and learnig it!
hie...~!!~!~!~!~!!
Submitted by Mansoor on Sun, 2008-01-27 21:50.
Hi. Tip is Mansoor. I completed diploma in instrumentation and am doing a training course in Automation(plc,scada,dcs..). This is very very much useful to me to get the updated info and to get boosting up my little knowledge:) thanx:-).
S5 PLC
Hi,
it is very usefull site but plz also include S5 STL logic that how can we make program in s5 plc.
thnx