Newbie seeks help designing a plc ciruit.

Z

Zardoz

Guest
OK. Dunno if I'm talking to the right people...


I need to build a circuit based on a plc that

1. Is programmable from a PC via serial

ie Set parameter X=20000
Start
and Stop operating

2. Operates independently of the PC
3. The program it runs has two inputs and one output. One input is
from a sensor. The second is from an encoder which provides pulses
(proportional to the rotation of a shaft).
4. After a predetermined (ie X) number of pulses, send an output.


I reckon this is an easy one but I don't know where to start. Any
clues? I think what I want to know is a cheap plc type device and lots
of help :)

Thanks
 
"Zardoz" <me@you.twang> wrote in message
news:hl2f0151o2u5ej7fpav1q6usb9sl0s3ouq@4ax.com...
OK. Dunno if I'm talking to the right people...


I need to build a circuit based on a plc that

1. Is programmable from a PC via serial

ie Set parameter X=20000
Start
and Stop operating

2. Operates independently of the PC
3. The program it runs has two inputs and one output. One input is
from a sensor. The second is from an encoder which provides pulses
(proportional to the rotation of a shaft).
4. After a predetermined (ie X) number of pulses, send an output.
Click to expand...
What will the sensor do then?

I reckon this is an easy one but I don't know where to start. Any
clues? I think what I want to know is a cheap plc type device and lots
of help :)
Click to expand...
What you want is a microcontroller. PIC, 8052, AVR or even a BASIC
Stamp; take your pick. I prefer PIC chips myself.
Look here:
http://www.voti.nl/pic/index.html
http://kahuna.sdsu.edu/~tucker/pic/
http://www.8052.com
http://www.avrfreaks.com
http://www.parallax.com/
 
The company I work for, Rogue Engineering Inc., designs equiptment for
use in industrial controls. One of our products is a smart I/O board
that can double as a simple PLC. We sell it along with PC software for
setting it up for around $200, which is cheap by PLC standards. Email
sales@rogue-engr.com if you're interested. Include specifications on
what the inputs and outputs should do and we'll make sure to load in
firmware that handles that task.

If you're looking to design a circuit yourself, for a hobby or school
project, then I would recommend looking at PIC microcontrollers.
They're not as powerful or cheap as some of the microcontrollers I use
at work, but they have a lot of support information out there for
hobbyists, and free/cheap tools for when you're writing and debugging
your firmware.

Tim Kirk
tkirk@rogue-engr.com
Electronics Design Engineer
www.rogue-engr.com

Zardoz wrote:
OK. Dunno if I'm talking to the right people...


I need to build a circuit based on a plc that

1. Is programmable from a PC via serial

ie Set parameter X=20000
Start
and Stop operating

2. Operates independently of the PC
3. The program it runs has two inputs and one output. One input is
from a sensor. The second is from an encoder which provides pulses
(proportional to the rotation of a shaft).
4. After a predetermined (ie X) number of pulses, send an output.


I reckon this is an easy one but I don't know where to start. Any
clues? I think what I want to know is a cheap plc type device and
lots
of help :)

Thanks
Click to expand...
 
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