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S7 program

Created by: oyb_71 at: 8/17/2008 4:37 PM (3 Replies)

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8/17/2008 4:37 PM	Rate (0)
oyb_71 Posts: 1 Rating: (0)	i've been asked to look at a machine that uses a old 1st gen S7 216, the PLC doesn't seem to be operating correctly and may need replacing. i'm fairly new to PLC's and programming and have a lot to learn, i was wondering if i'd be able to use the program from the older PLC in a newer gen S7 226 PLC without any problems or having to tweak it in anyway, would this be ok?
oyb_71 Posts: 1 Rating: (0)
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8/18/2008 5:12 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 11/4/2024 Posts: 4351 Rating: (1452)	Hi, genaraly the softwares are forward compatible. You will need to adapt some little thinks, like somoe IOs adress (if necessary). An easy compatibility test is upload the "old" program, change the CPU type (to the new desired model), and click in "check all" button.
	Denilson Pegaia Siemens Industry Sector Technical Support
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8/22/2008 4:45 PM	Rate (0)
GerardAmmerlaan Posts: 60 Rating: (1)	oyb_71 i've been asked to look at a machine that uses a old 1st gen S7 216, the PLC doesn't seem to be operating correctly and may need replacing. i'm fairly new to PLC's and programming and have a lot to learn, i was wondering if i'd be able to use the program from the older PLC in a newer gen S7 226 PLC without any problems or having to tweak it in anyway, would this be ok? hi there, You need to take into account the following things: 1. Expansion modules. the 21x expansion modules are not compatible with the 22x. So you need to replace them as well. 2. PLC programme. The 216 programme will also work in the 226, but the 226 is much faster. What will be the consequences for your application? The PLC programme itself, if it runs in a 216 will also run in a 226. It will just be wheeee way faster than before. I had a customer once who got into trouble after replacing a 215 for a 224 because of this. Gerard
GerardAmmerlaan Posts: 60 Rating: (1)
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8/27/2008 1:09 PM	Rate (0)
marcsinclair Posts: 49 Rating: (5)	PLCs (no apostrophe - it's a plural) in general, and the S7-200 in particular run their programs as a cycle, read inputs, evauate the programme, and then write the outputs. There will be little difference to the function If this happens 20 times a second or 200 times a second. It is generally a bad idea to make your program dependent on scan time anyway as this is inconsistent. Time critical code should be implemented using interrupts, immediate instructions or better still using specialist expansion modules. The 215 DP incorporated a PROFIBUS interface and should have been replaced by a 22x and an EM277. As for the original post, I've never had a lot of luck 'importing' from old programs and as the program is unlikely to be be very complex, I would recommend FULLY understanding the existing program, and then interpreting into the new processor. This way you will be able to support the new system, and there is no better way to learn that seeing and understanding how other programs have been written. Marc Sinclair http://s7-200.germainesystems.eu
marcsinclair Posts: 49 Rating: (5)	Last edited by: marcsinclair at: 8/27/2008 1:32 PM oops Spelling!
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