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Old 07-26-2012, 04:15 PM   #16
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But what is there any diffrence betwin the ladder and the block programing are they the same ?

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Old 07-26-2012, 04:53 PM   #17
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Originally Posted by quanchai View Post
But what is there any diffrence betwin the ladder and the block programing are they the same ?
The end result is the same.....the difference is how you look at it. Function block is more of a graphical interface while ladder is designed for old school electericians.

Or you can do it the way I prefer....structured text.

As we said before, we are not going to be able to teach you PLC programming over the net.....you just have to read the help.
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Old 07-27-2012, 08:46 AM   #18
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My suggestion is to check out some of the local community colleges or trade schools for PLC programming classes. The local community college here has a PLC starter class that's 4 credit-hours, so that will cost you a little over $250. Thats about as much money as a couple of hours of work hiring a programmer, and you now have now gotten your feet wet in a skill you could pad your resume with If you like it, go ahead and take the more advanced courses. Having the real device to work with at home to experiment with would be a total advantage to the classes!
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Old 07-27-2012, 10:05 AM   #19
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So far as programming things goes, I have done quite a bit of that...

And I have NEVER sat down, written a program, and then had it work 100% perfect or 100% like I want it to work, with the first try.

Programming, even with a fairly simple device like a PLC, takes a bit of writing, testing, and then making changes to get things to work properly.

Sort of a "hands on" thing. Not something which could be done over the internet. (Unless the programmer has the same *exact* device he can use to test his program.)

And the biggest problem with not being able to write a working program from the get go is poor instructions or documentation. There might be a command with options which are poorly explained in the documentation. You pretty much need to try different things to learn how that command works (testing).

Also what should work in theory may not work in real life. You may think 2 seconds is long enough for someone to press a button, but when you test it, 5 or 10 seconds might be better.

With that said, search google.com for the following words and you should find PLC forums...

forum programmable logic controller logo
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Old 07-30-2012, 09:18 AM   #20
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Quanchai,

Firstly, everyone has to start somewhere so good effort for wanting to give this a go. The Siemens LOGO! range is perfect for small (micro-automation) and is very easy to use so is a great place to start.

I have put together a couple of simple diagrams of what you are trying to achieve: 1 Input to activate 1 relay after being on for 5 seconds.

I have attached both the Function Block Diagram and the Ladder and the corresponding LOGO! files.

Lastly you said you have LOGO! Comfort, look within the help section and you will find basic tutorials which should help you get going.

I hope this helps.

Dave
Attached Files
File Type: pdf diagram-ladder.pdf (4.1 KB, 34 views)
File Type: pdf diagram-function.pdf (3.9 KB, 32 views)
File Type: zip diagram-function.zip (6.2 KB, 7 views)
File Type: zip diagram-ladder.zip (7.2 KB, 2 views)
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Old 07-30-2012, 11:39 AM   #21
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Try YouTube. There may be a tutorial. Why not just use a on delay timer?

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