has somebody worked with PicoPLC?

StefanL38

Hi,

has somebody worked already with PicoPLC from Attila Kolinger?

see this thread: http://forums.parallax.com/showthread.php?121404-PICoPLC-Free-DIY-PLC-with-Propeller

There is some documentation. But I still find it hard to understand. What I would need is a diagramm and description
of a simple automated process like

There are the switches S1 and S2 if both are pressed at the same time output A2 will be turned on for three seconds ... etc.
and the related ladder-logic for this example.

Even better if there would be an example for each ladder-element.

Otherways I have would have to do try and error with each and every combination trying to understand what the ladder is doing.

best regards
Stefan

StefanL38

OK as nobody has answered yet. I started playing around with picoPLC to find out how it works by tral and error.
I understand a few first things. If my knowledge will grow is anybody interested in explained examples?

If yes drop a short answer.

best regards
Stefan

Duane C. Johnson

Please continue as I am interested in your experiences.
No, I haven't tried PicoPLC but it intrigued me.

Thanks!
Duane J

skylight

You get a 404 when you use the links in the linked thread, have you working links?
I have experience with programming other PLC's such as Siemens and maybe could help once i've played with picoPLC

For your example you would put two inputs in series with a timer and an internal relay then use that relay in series with an output

Not knowing the program I can't help yet with what settings , labels, inputs,outputs ,timers etc

JordanCClark

skylight wrote: »

You get a 404 when you use the links in the linked thread, have you working links?
I have experience with programming other PLC's such as Siemens and maybe could help once i've played with picoPLC

For your example you would put two inputs in series with a timer and then in series with an output

Not knowing the program I can't help yet with what settings , labels, inputs,outputs ,timers etc

Ditto.

StefanL38

Hi,

I try to attach a zipfile to this posting ...

seems to work.

I found out some basic things myself. And-function is clear. How would you design a "self-keeping-switch"?
best regards
Stefan

skylight

Ok just had a quick play with it and attached are a text file and a picoplc file(had to give it a txt extension to upload it, just change the .txt bit back to .picoplc on the one with program in the title),
hope that's what you intended to happen
regards
skylight

S1&s2 timed output.txt
S1&2 timed outputprogram.txt

edit actually i've just re-read your original post and it wasn't a 3 second delay you wanted but an output for 3 seconds, i'll re-do the files and attach them later, sorry about that.

skylight

Here are the revised attachments(rename the program one's extension as before) the timer works with momentary push buttons, in the simulation you will need to release at least one or both pushes by double clicking again to simulate releasing the pushes for the timer to start timing (also you could play with the one shot instructions ie add a one shot rising instruction after the second input S2 this will allow the timer to work regardless of whether the pushes are still made or not) .

Also attached is the compiled Spin file for the one shot circuit, although I have to say I havn't tested it, perhaps someone could? It uses pins 1(PA0) and 2 (PA1) for inputs and pin 3 (PA2) for output

S1&2 timed outputprogram revised.txt
S1&s2 timed outputrevised.txt
S1 &S2 timed output with one shot.txt
S1 &S2 timed output with one shot.spin

JordanCClark

Variations of a theme. Just shows more than one way to do a task.

Also, Did you want an example of a toggle? Added that one, as well...

skylight

The program works with the Dip version of propeller I have the quickstart board and i'm trying to tally up the pins accordingly but not being able to find out a comparison in the documentation, does anyone know the pin for pin between the Dip and quickstart ie what pin(s) would I select to run the leds (pins 16-23 on quickstart)

JordanCClark

Looking over the compiled spin code, it seems straight forward. It compiles to the port (PA0, PA1, etc.), not the pin.:cool:

In fact, I was just starting to dig out my Quickstart when I saw your post! Great minds and all that...

skylight

Thanks Jordan I am a beginner with the prop and not sure how you would link the port to the pin as such so as to light a quickstart led, had any luck?


I'm going to post in the propeller forum a compiled spin file and see if anyone has any ideas

StefanL38

Hi everyone,

thank you very much for all the example files! Have to go through them.
I made progress myself in understanding ladder-logic.
I found to bugs in the spin-code:

The autoerated spin-code from picoPLC produces a wrong textline for the chrystal setup.
The direction register DIRA for outputs are not setup properly

The outcommented lines are the wrong ones generated by picoPLC.
I have already sended an Email to the author of picoPLC. He answered me that he will send me
the newest version of picoPLC in a few days. Have to ask if I'mallowed to upload it here.
(He's busy with his daily work for making money.)

CON 
_XINFREQ = 5000000 'Hz 
'instead of 
'_CLKFREQ = 5000000 'Hz 
 _CLKMODE = XTAL1 + PLL16X 
CycleTime = 100 '1/sec 

PRI PlcCycle | timing 
  DIRA[U_Y2] := 1 
  DIRA[U_Ynews] := 1 
'instead of 
'  DIRA := $00000000 
'  DIRB := $00000000 

@skylight: The IO-Pin-numbers of the quickstart-board are the same as with the DIP-version.
picoPLC and spin uses the logical pin-numbers. There are IO-pins numbered from 0 to 31

Edit: the autogenerated code produces the codelines
DIRA := $00000000
DIRB := $00000000

which set ALL IO-Pins as input.
So you ave to look up the code manually how Outputs are named and you have to insert
new lines of code

  DirA[NameOfOutput] := 1  'set up IO-pin as Output by setting DirA-bit to 1

The hardware-pin-numbers of the housing may differ but the logical pin-numbers are always the same
for each propeller-chip and each propeller-board.

try these corrections and post the results here.

best regards
Stefan

skylight

I'm at work now but will try the alterations as soon as I can, thanks for the help Stefan
You may also be interested in a thread I have started in the Propellor forum regarding this program?

Devin Frioud

Hey people!

I was wondering where I could get the required software, as the links show a 404 page not found.

Thanks,
Devin

NWCCTV

http://forums.parallax.com/showthread.php/121404-PICoPLC-Free-DIY-PLC-with-Propeller A couple posts down are the links.