Counter...but not a counter

icecursor

Member
I
Join Date
Aug 2013
Location
Mississauga
Posts
13
Hey everyone,

I was just wondering if there was a way to make a counter idea without a counter function. For example, if I were to make an input true 5 times, is there somewhere that could be found? and counted using binary?

Thanks,
Phil
 
Well most PLC's have an ADD function. You could just add 1 to a specific memory register every time the input signal is triggered. You may have to include some type of one-shot logic to prevent the ADD from continually cycling if the input is held on.
 
What is an "oe".

You are going to have to have some kind of instruction that accumulates a value.
 
The project I'm trying to do is this...

With a momentary switch turn on a light and have it stay on. Then when you press the switch again, the light turns off. I'm only allowed using the basic instructions ( NO and NC contacts, and the basic Output) in the logic.
 
icecursor said:
The project I'm trying to do is this...

With a momentary switch turn on a light and have it stay on. Then when you press the switch again, the light turns off. I'm only allowed using the basic instructions ( NO and NC contacts, and the basic Output) in the logic.
Click to expand...

Search the forum for "Flip-Flop". Or push to start push to stop.

But what does this have to do with a counter? You can use a counter to accomplish this, but that is not your assignment.
 
Since I can't use the flip flop... as I said before only the 3 basic functions.

I was wondering if I could use something along the lines of a counter idea. Like when the push button is pressed, it records that press and it records that press in a bit. if that bit records in binary, than I can select the first bit to turn on and off the light
 
See below, as stated earlier this has been covered in a lot of earlier post, just search "flip flop". There are plenty of different ways to accomplish it but this one works.

FlipFlopLadder.jpg
 
Since I can't use the flip flop... as I said before only the 3 basic functions.
Click to expand...

Its not a flip-flop circuit if that is what you are thinking. Its flip-flop logic. Do the search.
 
Take a close look at this animation that is being used as an avatar by one of our forum members.

image.php
 
What you're looking for is a "D Flip Flop Counter". It's a basic circuit taught in introductory logic circuit design.

To create a binary counter, you chain together several flip-flop circuits so that each is driven by the output of the previous one.

The state of the output of the first flip-flop represents the first bit of the binary word. The state of the output of the second flip-flop represents the second bit of the binary word. And so on.

So start by mastering the basic flip-flop logic in whatever PLC make and model you are using. Then try using the output of one as the input to another.
 

Similar Topics

id10t_error
1769-L24-QBFCB1 Embedded Counter Fault Reset (OK Light Flashing)
Hi Guys, I have a 1769-L24-QBFCB1 that has the OK light flashing on the embedded counter module. The manual states it is a resettable fault, but...
Replies
0
Views
104
id10t_error
id10t_error
A
1794-VHSC Counter Mode / Module Faulting
Hey Everyone, After reading a lot on this forum and elsewhere I see not many are fond of the 1794-VHSC module. I can see to a degree as I was...
Replies
3
Views
154
AD-PLC
A
A
MOMENTUM HIGH SPEED COUNTER WIRING AND SOFTWARE CONFIG
Hello Folks, Has anyone configured a Momentum high speed counter on Unity 13.1. We need the wiring diagram for Momentum High speed counter and...
Replies
0
Views
76
autodepart
A
afm
Encoder Revolution Counter
Hi all, I am working with an incremental encoder (ABZ signals, 360 ppr (so 1440 counts per rev)) to replace the existing "manual" encoder wheel I...
2 3 4
Replies
51
Views
2,610
MaxK
M
M
Counter reset
Hi y'all Just a quick question for using Rslogix 5000 I'm using a counter up bit with an analog signal (0-10V). When 10V is measured, counter...
Replies
5
Views
232
Steve Bailey
Steve Bailey
Back
Top Bottom