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LADDER LOGIC !!!

Created by: 93Mustang at: 11/30/2007 4:38 PM (3 Replies)

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11/30/2007 4:38 PM	Rate (0)
93Mustang Posts: 65 Rating: (0)	Are there examples of using S7-300 processors showing how to program solely in ladder logic. I am so frustrated with the manuals and forums showing nothing but STL SCL or GRAPH examples that do not even convert to ladder. It seems you have to be a computer programmer to use this equipment. I've just read through countless pages on how to use arrays and found nothing but STL SCL examples. I've progrmmed using A/B GE Fanuc Telemechanique and Modicon and S7 programming is by far the most difficult to understand. Things that are considered basic functions in logic you simply cannot do in S7.
93Mustang Posts: 65 Rating: (0)
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12/1/2007 10:25 PM	Rate (1)
Late Platinum Expert Joined: 1/7/2006 Last visit: 2/16/2023 Posts: 2705 Rating: (311)	Please download the handbook LAD/FBD programming so that you may find the easiest way to use simple logic....
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
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12/2/2007 10:50 AM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 5/27/2023 Posts: 12022 Rating: (2594)	Hello Mustang; In Siemens S7 PLCs, it is true that all indexed addressing and indirect addressing instances have to be programmed in STL, using pointer and ANY pointer tools. If at first it seems perplexing, STL is a very easy to get used to, with just a little initial reading and (possibly a bit of) work. You will find that as a programming tool it frees you from the limitations of graphic representations (such as Ladder, FDB). It allows loops, array processing, pointers and a lot of other tools to be implemented in a systematic fashion. Again, it takes some getting used to; but if you stick with it you will fing it very powerful. Hope this helps, Daniel Chartier

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12/2/2007 7:45 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 2/16/2023 Posts: 2705 Rating: (311)	Hi, With higher programming tools like SCL you could even programm very easy datastructurs, that couldn't be hardly programmed with LAD of FBD. Those programming languages could even used together in one program, for example all standard logic in LAD, the sequential logic in S7 GRAPH and the data logic in SCL....
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
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