Microligix 1500 counter

kenlr

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• Jul 12, 2005

• #1

Hey

Im new to programming plcs, and here is what Im tring to do

I have a bagging system for a fine powder, I want to count a numbr of bags, and at a set number of baggs I want to energize an output to a sampler. (I want to take a sample of every 500 bags)

What Im not sure of is how to set up the counter to count a certain input, the energize a cartain output when the count is reached

If some one has a basic counter program I could look at that would be a big help

Thanks in advance

 

mgvol

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• Jul 12, 2005

• #2

Here is one way to do it.

 

504bloke

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• Jul 12, 2005

• #3

Using an SLC see attached pdf

The Input i have ised is a standard 24vdc input

Its a very basic 2 rung program to give you an idea, you could tie a proximity sensor to that input ?

It depends on the speed of your bags passing the input to the plc really.........

Like i said this will give you an idea

Its on Logix 500 on an SLC

edit: looks like i was beaten to it !

 

kenlr

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• Jul 12, 2005

• #4

that will help

Thanks

 

gbradley

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• Jul 12, 2005

• #5

Do you need a one shot on I:0/0 ?

 

Ken Moore

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• Jul 12, 2005

• #6

Counters do not require a one-shot, because they only count falst to true transitions.

 

gbradley

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• Jul 12, 2005

• #7

Thanks Ken
I read that but it didn't soak in.

 

kenlr

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• Jul 12, 2005

• #8

ok I loaded the little two rung counter program, On the bench, and it counts ok, but when it reaches the prste value it does not drive the output, or rest,

an I missing something

Thanks

 

TConnolly

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• Jul 12, 2005

• #9

What is the two rung program you put in?

The sample posted by 504Bloke will turn the output on for a single scan because the counter is immeidately reset. If you used that sample then that is why you are not seeing the output, its on for probably less than a millisecond.

You need to seperate the counter reset logic from the output rung.

Have a look at the other example as well.

 

kenlr

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• Jul 12, 2005

• #10

Ya that is the one I used, but it dident reset the counter. what program do I need to use to open the first one

 

TConnolly

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• Jul 12, 2005

• #11

Just click on the link counter.zip. When WinXP asks if you want to open or download the file, just click open. A zip file is just a compressed folder that contains other files. When the folder opens then you will see the file Counter.RSS. You can double click it to open it with Logix-500. When Logix 500 says its a read-only file, just click OK.


EDIT:
Here, just in case you have difficulty opening mgvol's file, and/or so someone else without RSLogix can see it, I converted it to a PDF and attached it.

(The oneshot at B3/0 is not really necessary as the counter DN bit will be clear when the timer is next scanned, thereby resetting the timer DN bit)

 

Last edited: Jul 12, 2005

TConnolly

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• Jul 12, 2005

• #12

Also.... it seems you could do with an instruction set reference manual.


Get it here:
http://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1762-rm001_-en-p.pdf

 

kenlr

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• Jul 12, 2005

• #13

Thanks for the help, I had to use rslinx to view the file

Im out of here for the day, but ill be back tom.

Thanks again for the Help

 

Eric Nelson

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• Jul 12, 2005

• #14

We don't know how fast you're filling bags, so there's one minor addition I'd add to Alaric's solution. I'd add a latch to the second rung, and reset the counter immediately, to avoid missing counts.



-Eric

 

bernie_carlton

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• Jul 13, 2005

• #15

Kenlr in the first post mentioned that this was for sampling after X number of bags. The counter is counting full bags completed not the product itself. The output would probably divert the product flow for a certain amount of time into whatever is receiving the sample. After this time the product (he mentioned a fine powder) would presumably go back into filling bags. The counter would be reset and then, when the next bag is completed, count to 1.