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S7-1200 & STL

Created by: fritz at: 6/25/2009 2:21 AM (19 Replies)

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7/13/2009 10:48 AM	Rate (0)
Smurf Silver Member Joined: 9/28/2005 Last visit: 10/24/2024 Posts: 414 Rating: (28)	ritu IBN-Service wrote: And preferably the sameSTL of the Step7 for 300/400! Even better: Step7 usable for 1200! Completely agree with you! Thanks Hi All, Just wait a year or two and in the meantime watch what happens. I think you'll like it. Changes in the S7-300/400 range are already happening. The future is nice again.
	Smurf "The only difference between a problem and a solution is that people understand the solution."
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7/20/2009 12:57 PM	Rate (0)
Jeebs Posts: 218 Rating: (28)	Pegaia Hi, I'm not a fortune teller, however, the Focus is first SCL. Somethings that needSTL /or absolut adressig in the past, could be alredy solved with LAD / simbolicin thisnew tecnolgy (for example date and time splitable). Important is don't lose the functionalities, independently the technology (STL, SCL, etc.). Sure, almost everything can be done with LAD, but in sheer programming speed and optimization of code, STL is the clear winner. Alot faster then LAD and a lot less prone to syntax errors then SCL. I get what they are trying to do. All other PLC brands use almost exclusively LAD. And Siemens now wants to make it easier for them to change from what they know, to the unknown thing that is Siemens. A thing that has a reputation of being very hard to learn. The day STL gets dropped completely will be a sad day in PLC history.
Jeebs Posts: 218 Rating: (28)
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This contribution was helpful to 1 thankful Users fritz

7/21/2009 10:26 AM	Rate (0)
Aristotelis Posts: 147 Rating: (34)	Jeebs I get what they are trying to do. All other PLC brands use almost exclusively LAD. And Siemens now wants to make it easier for them to change from what they know, to the unknown thing that is Siemens. A thing that has a reputation of being very hard to learn. This is not a reason (nor an excuse) not to implement STL functionality, since noone is forcing anyone to use STL, but it seems that this situation is forcing users to use LAD. One will swap over to Siemens for the quality, the support, the software, all the factors that minimize the developing time and thus maximizing the profit from an engineering (as well as financial) point of view. However, IMHO I think there is a very good reason that the IEC-61131 standard defines a text language (the missing STL), and it is a good thing to adhere to standards. Aristotelis
Aristotelis Posts: 147 Rating: (34)
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9/21/2010 8:46 PM	Rate (1)
hernan_e Posts: 53 Rating: (2)	I think the opposite and I could say that when system complexity grows, SCL is far better than STL I understand the need of STL, perhaps you have experience in STL, and libraries, and that's a great value, but to evaluate a language itself you have to take account more objetive points When programing any complex system Readability is a must for Maintainability, and control flow statement are really clearer than testing bits and jumps, variable names are far easy to read than local STL bits with L and numbers notation, pointers in STL aren't simple neither, in SCL you can use base type arrays, UDT arrays, loops, named indexes, indirect addressing, code is then more readable and clear, furthermore it's based on an standar http://en.wikipedia.org/wiki/IEC_61131-3 give SCL a chance and perhaps you won't back to STL, except in an exceptional situation ;)
hernan_e Posts: 53 Rating: (2)
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9/22/2010 9:45 AM	Rate (0)
Smurf Silver Member Joined: 9/28/2005 Last visit: 10/24/2024 Posts: 414 Rating: (28)	When there the new STEP7 Professional, where also S7-300/400 is programmed with, you can use STL for the S7-300/400. as far as I am informed STL is still not planned in STEP7 Basic V11.
	Smurf "The only difference between a problem and a solution is that people understand the solution."
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11/3/2010 10:00 AM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (154)	I had tried to make a complex SCL program and then whatched the compiled program in STL, and I have to say that compiler did a good job. I wold make more STL code and not so optimized as compiler did. So I use ladder and SCL, no STL anymore.

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12/14/2011 4:25 AM	Rate (0)
fritz Diamond Member Joined: 10/7/2005 Last visit: 4/26/2025 Posts: 3047 Rating: (1061)	If the just released STEP 7 Basic V11.0 SP2 manual is anything to go by, it seems that STL will finally be available for the S7-1200. All I can say is: Thank you Siemens and two up for this(I shall place SP2 under my X-Mas tree ).
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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This contribution was helpful to 1 thankful Users hdhosseini

12/14/2011 8:47 AM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (154)	Keep bells and whistles away, only S7-300/400 will mantain STL. Attachment Capture.JPG (835 Downloads)

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12/14/2011 11:27 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	Marko Bursic Keep bells and whistles away, only S7-300/400 will mantain STL. Hmmm.. they talking about SCL - sources....
IBN-Service Posts: 8946 Rating: (1000)
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12/14/2011 11:47 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 4/22/2025 Posts: 6867 Rating: (1367)	IBN-Service Marko Bursic Keep bells and whistles away, only S7-300/400 will mantain STL. Hmmm.. they talking about SCL - sources.... SCL is much efficient than current LAD and FBD. SIEMENS may think STL is superfluous in this case.
	Demo Channel on Youtube
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