help needed

alvin

Hi I am a newbie here. I am also a newbie to plc. I have a question is that I have two switch(stop and start)and a bulb.what I would like to do is that to write a LD to make the bulb blinking with the most basic way which is just using NO, NC, Coil and Timer.
Then I would like to write another LD following the one above with the command press start once the bulb light up but not blinking then press start again the bulb start to blink.

Hope that you guys are willing to help me out
Thanks in advance

Post Edited (alvin) : 5/28/2010 11:18:20 PM GMT

hover1

What is an LD?

Jim

Mike Green

Ladder Diagram

There are really no instructions or manuals or the like here on writing or using ladder diagrams. These forums are about the use of Parallax Basic Stamps and the Parallax Propeller. There are all sorts of tutorials on how to write programs for the Stamps. Start with the Educational Tutorials and the Stamps in Class Resources here (www.parallax.com/tabid/477/Default.aspx). The "What's a Microcontroller?" tutorial is a good starting point. You might also look at the "Process Control" tutorial.

Post Edited (Mike Green) : 5/28/2010 11:58:33 PM GMT

hover1

Thanks Mike.

I didn't click. My Dad did a lot of PLC, I just wish I had wanted to learn that while he was still alive. He was pretty good in that area.

Jim

Brian B

a simple program is, depending on what input your switch is i will use P1 and P3 for the led

IF (P1 = 0) THEN
PULSOUT 3, 65000
IF (P1 = 0) THEN
DO
PULSOUT 3, 65000
PAUSE 2000
LOOP