twinkle
Posts: 5
Joined: Sun Aug 30, 2015 7:08 pm

I want to learn more PLC, point me in a direction?

Sun Aug 30, 2015 7:14 pm

Hi,

I'm a electrian and want to learn more about automatioan and PLC programming. I got a raspberry pi model b and and a rapberry pi 2 model b. As i have found out I can use these for PLC programming and explore the world of PLC.

Is there anything more basic stuff I would need? Some type of breadboard, cables, LEDs, pushbuttons?

User avatar
KLL
Posts: 1453
Joined: Wed Jan 09, 2013 3:05 pm
Location: thailand
Contact: Website

Re: I want to learn more PLC, point me in a direction?

Mon Aug 31, 2015 4:25 am

somehow funny that a electrician asks if he should have a push button and a LED but already knows a RPI can be a PLC??

well from the classic PLC there was only digital I/O,
insofar there a RPI would fit.
but usually a PLC never has a multiuser multitasking GUI operating system.

but the times changed, now PLCs have analog I/O like the process control systems, there are softPLC running even on windows....
but usually:
a PLC and its visualisation/operating station are 2 separate boxes linked.

how you play that on RPI?
use it for the operation / trending / development only

and use a ARDUINO as PLC
it can run 24/7 and do its job, and the RPI would be used only, if operation is needed ( setpoint change or even program change )
you can write a multijob / timeslice environment for arduino,
with a ( low priority ) serial menu for operation.
use RTC and timed jobs ...

i not know what program you play on RPI as PLC, but i think
can start with python and learn GUI programming ( for operation.. )
and after some good time play you can have your own under 100$ ProcessControlSystem http://kll.engineering-news.org/kllfusi ... tvalve.jpg

boyoh
Posts: 1316
Joined: Fri Nov 23, 2012 3:30 pm
Location: Selby. North Yorkshire .UK

Re: I want to learn more PLC, point me in a direction?

Mon Aug 31, 2015 8:01 pm

If you are a electrician working in a industrial
Environment, learning about PLC control and
PLc programming is a must, There are two
typs of logic control Sequential and
Combinatial logic. Sequential is used in a
Ladder logic program in the PLC normally
Used in Industrial control applications.
The PLC scans in/put modules that receive
signals from sensors or switches , then switch
out/put modules ,to send signals to relays
or motor starters, There are modules that
convert analogue in/put signals to digital signals,
I don't think the Pi is designed to use on a industrial
scale.But you will learn a lot from the Pi

I
BoyOh ( Selby, North Yorkshire.UK)
Some Times Right Some Times Wrong

bw1pi
Posts: 16
Joined: Mon May 18, 2015 6:13 pm

Re: I want to learn more PLC, point me in a direction?

Tue Sep 08, 2015 1:17 am

twinkle
I have been doing automation for the last 2 decades and can tell you sadley, you are looking in the wrong direction.
The pi is great for the IT side including DAQ and IoT ( Internet of things ) web based stuff ( being a small Linux PC ).

If you want simple PLC stuff to learn ladder logic, I suggest an Automation Direct Click PLC.
The software is free ( a big plus in my book for users ) and the clicks run around $100-200 with Modbus communications.
Its not free, but having a real thing you can do real world stuff with is always fun.

bw1pi
Posts: 16
Joined: Mon May 18, 2015 6:13 pm

Re: I want to learn more PLC, point me in a direction?

Fri Sep 18, 2015 6:29 pm

FYI
free eBook
PLC Handbook
A Practical Guide to Programmable Logic Controllers

http://library.automationdirect.com/plc ... tent=enews

Return to “Beginners”