Introduction to PLC Ladder Logic, Part 1

Oh man you have no idea how happy you just made me with this video! I love tinkering with things and learning how they work. I just got back from Busch Gardens today and was wondering how the safety systems worked on the coasters. Some research like 20 minutes ago helped me figure out it was a PLC! This answers just about every question I had! I've *always* wondered how a computer takes real-world data and converts it to bits and vis-versa! You rule! I want to learn more about this.

I hate it I've been struggling with the door simulator trying to use two sets of latch and unlatch and also OSR's.
What Im trying to do is to have the door stop everytime I push the close button while the door is moving up and a second time to actually close the door back down or viceversa. HELP!!!

thank you so much this has helped me a lot with a class im taking TY TY TY

This is good information. I work on ion implanters in the semiconductor industry, and we use some of this but not enough of it to keep me up brushed up on it. Thanks for the information.

Ok, beer is always welcome... Especially considering you are from the UK. We are working on putting together a larger offering on our site, but we are not there yet.

Wow!!I wish I could buy you a beer!!This is brilliant,do you do a tutorial CD or book,I live in the UK.Thanks so much for posting this,you have done this very well,Thanks!!

No problem. You can go to our site contact page. I am not an S7 guy, and all our Seimens proficient people are on startups. You can send me a question via the contact page and I can forward it to one of them.
rw

well first of all thx for the reply
please don't u have an e-mail adress i'm workin on a project and i need some assistance
i know it's too much to ask but here i am there is no harm in tryin

Sorry I didn't answer this, but I will need to you ask the question differently because I do not understand your question.

Thought about it... That's about as far as we have made it. Still have so much to do on the AB that it will be a while for the S7.

great
well don't u have a tutorial for the simatic manager step 7
thx
waitin for ur answer

use my poor english to answer some questions
button & relay have NO & NC
PLC also has NO =|| NC=|/|
button & relay have same lable but different address zone.

yes it was, i've been working as an electrican helper for the past 2.5 years, and have powered up and terminated, working under a journeyman,in many PLCs but have never really understood how they funtcion

Sorry I am not sure I understand your question. Can you elaborate?

You may see some differences in NC (Normal Closed) and NO (Normal Open) contacts and connections to PLC Inputs. Are they here shown for purpose? To give Instructor an opportunity to make more detailed explanation?