May 25, 2013 LADSIM is a fully functional ladder logic design and PLC simulation software program that incorporates the functions used in PLC ladder.
OK Dave, you are still here after the barrage so I shall try to help. The problem we are all having is your question - it does not make a great deal of sense.
Melsec; I must presume you mean 'melsec medoc'. This is a now obsolete but still much used (and preferred by some) DOS based Mitsubishi programming software. Because it is no longer supported, it does not program the latest Q and FX3 plc's. And with it being a DOS program it is not really compatable with Windows XP or probably Vista. Ladsim: This is a plc simulation program. It is not like Mitsubishi plc programs.
It uses different address for inputs/outputs etc. It is used to learn the basics of programming and is cheap. You dont need to pay for real software or a real PLC. GX developer is the latest version of medoc.
It is windows compliant and programs all the latest mitsubishi PLC's. Good Morning Dave, or well it's morning here Sorry I didn't reply last night. I got a little number 2 on Crossbow's list Goody has given you the best answer for what we have to work with. Without some more details I don't know what we can do to help you. So I'm going to back up and give the shotgun answer. Follow the links in the thread below.
They lead to some good information on general learning. It is not manufacturer specific but gives some good basic information A 1000 Step version of GX Developer can be downloaded here. It is fully functional and will do most of the programs you will encounter while learning. Once you have the software installed go to the following link and look at some of the programs.
Many times the best way to get a grasp on a subject is to just dive into it PLC Law - A good thread of basic rules and guidelines based off of mistakes and experiences of users in the past There are many more great threads and links, but this will get you started. And once you start playing with the software you are sure to run into specific questions.
When you do just start a thread here and ask. But make sure you are specific with your question. Post screen captures, program code, pictures of your girlfriend, whatever it takes to make your question clear Oh and I almost forgot, welcome to MrPLC TW. Well, I've spent most of my life programming Milk Processing Plants, but I haven't a clue what the question means. It could be one of those questions that was written back in the '80s and has never been updated, and refers to the single line editing screens, the graphic editors and the tape based storage systems of those days (shudder), or it could be an up to date question that refers to the various levels of software sophistication in the various packages that exist today. Without knowing a bit more, it's not an easy question to answer.
This is harder than it seamed. Poorly formulated or incomplete questions make task so much more difficult. Ladder logic seam to be universally accepted, it's main advantages include common look and feel regardless of used product (as long as you stay with basic instructions) and you can see what is happening while program is running.
There are of course other languages (FBD, SFC, STL, IL, ST). Many popular platforms (not just PLCs) seam to support more than one language. Unfortunately I have not ever seen even ONE such platform that will allow you to pick language of your choice (and only one!) and let you complete the project (unless that is something trivial).
So if you are working on multilanguage platform, you better be ready to use at least two languages and occasionally rewrite something in different language because one you started with doesn't support it. One other thing in general (my own impression) is that such products are slower (programming enviroment alone is much larger), less stable (nobody ever has time to 100% debug product supporting 5 languages before product is out of date of even obsolete, many products are evolving for years which doesn't help when you need to finish project in few weeks). Lower productivity in that respect is meant to be offset by fact that user has oportunity to choose more suitable language for different parts of the project. I'm not quite sure what is meant by 'using mnemonics' (also called IL - instruction list): 1.
It is possible to view code in that format but this is not the easiest thing to start programming in or to troubleshoot, specially for more convoluted pieces of code or larger chunks of code. It is not the same but it compares pretty well to assembler code vs. High level language on PC for example. On some PLCs this is the only way to do something so this is tipically used to create own functons or pieces of code which is then called by main program (writen ladder or whatever.). After while everyone uses mnemonics to simply enter code faster, even if actual programming language is ladder. This is convenient way to edit code, changing instruction mnemonic you get different function while parameters are tipically still retained. This is also convenient way of generating code (on some PLCs, so far Mitsubishi doesn't seam to use system clipboard for actual code).
I use excel all the time to produce long code pieces (using mnemonics) and then dump it into PLC. PLC editors are never fast enough. One key feature I'm looking for in a PLC editor is to allow quick import/export to text to excel file. Usually copy/paste works well on most of them but this is not always case. I use any language that is available but if it's PLC, I prefer ladder. One thing I found with some languages was that printing may be a problem.
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Lot's of people out there ask for printed copy of the program and FBDs for example can be pain to fit to print size and I don't like to spend time formating.or rewriting. I remember occasion where I could not even print ladder. It worked of course but I couldn't find way to expand instructions so all parameters get printed (this was long time ago on one product v2.6. And customer no longer insists on code printout. I didn't test this in years but that product is much better now).
Any of several regulars here can help you. What have you done so far? What don't you understand? Post your ladder logic and your specific questions and we'll try to steer you in the right direction.
![Ladsim Ladsim](http://1.bp.blogspot.com/-exTIQ5JkpOM/T8V3apOG9kI/AAAAAAAAAWU/-UFA5hFr9Cw/s1600/1.jpg)
What we won't do is just hand you the solution. Most of us here are of the opinion that if we give you a fish you can eat for a day, if we teach you how to fish you can eat for the rest of your life. Far too many students come here expecting to have their homework done for them. I'm sad to say that a significant percentage of them are from Great Britain. I hope you're out of a different mould.