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Conversion of Bool to Word and Others....

Created by: Timmy at: 8/13/2012 5:37 PM (6 Replies)

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8/13/2012 5:37 PM	Rate (0)
Timmy Posts: 41 Rating: (0)	I am using the TIA v11 sp2 with update 4. Ihave a S7-416Fcommunicating with a siemens DCM and a third party PLC and need to do some BO_W, W_BO while working on that I was going to write some FCs to cover some of the other conversions that I would like to have with the project for future reference and for me learning how to do it. I am trying to get my head around the best way to do it in TIA and am wanting some suggestions. Ideally I would like an FC where you plug in a raw DBs Bits and then a word on the destination DB. DB1 Bit 1-->16 = DB2 Word 1 DB1 Word 1= DB2 Bit 1-->16 With TIA and stl can anyone suggest the least memory required course of action? Many thanks in advance.
Timmy Posts: 41 Rating: (0)	Last edited by: Timmy at: 8/13/2012 5:37 PM
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8/13/2012 11:52 PM	Rate (0)
fritz Diamond Member Joined: 10/7/2005 Last visit: 1/17/2025 Posts: 3030 Rating: (1058)	Hello Timmy not too sure if it is the "least memory required" solution, but Siemens has TIA Step 7 Basic based example Blocks which you can download fromHow can you group separate signals (variables of the "Bool" data type) to one variable of the "Word" type and again extract them from that "Word" variable (Bool - Word data type conversion)?. I haven't tested these but believe they should also work in a 300 or 400 (Ican't even say if it is programmed in STL, if it is the blocks will be protected as STL is for some bizarre reasons still officially not allowed to be used in a 1200). Alternatively, you'll finda "Step 7 classic" based STL solution at Extract bit from word for a huge number of wordswhich you'll either need to retype or convert to TIA Portal Step 7 format to use it. I hope this helps
	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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8/14/2012 3:14 AM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 1/16/2025 Posts: 15541 Rating: (2465)	fritz Hello Timmy not too sure if it is the "least memory required" solution, but Siemens has TIA Step 7 Basic based example Blocks which you can download fromHow can you group separate signals (variables of the "Bool" data type) to one variable of the "Word" type and again extract them from that "Word" variable (Bool - Word data type conversion)?. I haven't tested these but believe they should also work in a 300 or 400 (Ican't even say if it is programmed in STL, if it is the blocks will be protected as STL is for some bizarre reasons still officially not allowed to be used in a 1200). Alternatively, you'll finda "Step 7 classic" based STL solution at Extract bit from word for a huge number of wordswhich you'll either need to retype or convert to TIA Portal Step 7 format to use it. I hope this helps In the S7-1200 Basic version of the portal, you can import legacy (pre-TIA Portal) Step 7 SCL files and have the portal generate blocks. I would expect something similar to work for STL files for the pro version. Look in the external source files section of the project view. The help fileis decent enough. If you have an STL solution in Step 7, odds are you can directly import it in a saved stl file exported. You could also save it to SCL and import it that way. I suppose the pro version will save it as an stl for you, right?
	science guy
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8/15/2012 12:45 AM	Rate (0)
Timmy Posts: 41 Rating: (0)	Fritz, The example from siemens for TIA is for S7-1200 and is using some blocks that are not available in S7-400. The main block is not write protected. They are using a convert function to convert the word to an unsigned int and then check if the int is greater than 32756 (?). If it is greater than you know the first bit of the int is true so set that bit true. Then convert it back to word shift it left and then back to int and repeat for each bit. So I tried your example and for the life of me could not figure out why the line with the And function would not work. I was typing everything in manuallyand everything before the first A statement worked. I tried help files and manuals to see if it is syntax (I am still assuming that it is because how could you have STL with the A function not working). Anyway so I could not get your version in STL working either. So for my S7-416 I ended up creating some FCs in SCL and in SCL apparently there is a much better convert function. The word to int and dint is one line. I did the word to byte (high and low) by using thw word to byte function (gets the lower byte) and then shifting the word to the right to get the lower byte. I used a similar logic for the bits. I get the lowest bit then shift, get the lowest bit then shift....16 times. Things are working but I don't know if this is the fastest/less time consuming/more streamlined approach. If anyone else knows of better ways for S7-416 with TIA v11 SP2 I am still all ears. Thanks.
Timmy Posts: 41 Rating: (0)
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8/15/2012 3:18 PM	Rate (1)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 1/16/2025 Posts: 15541 Rating: (2465)	Could you simply create an function with the AT construct that maps the bits into a word, copy the word to the output and the other way around for words to bits? That would allow fast memory mapping. I remembered this FAQ ( https://support.automation.siemens.com/WW/llisapi.dll?query=using+at+portal&func=cslib.cssearch&content=adsearch%2Fadsearch.aspx%3Ftab%3D2&lang=en&siteid=csius&objaction=cssearch&searchinprim=_searchinprim_&nodeid=99&x=16&y=8&cssearchengine=NEW) was very similar to your request.
	science guy
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8/16/2012 1:42 AM	Rate (0)
Timmy Posts: 41 Rating: (0)	I tried the AT in SCL FCby doing the following (shorthand version): Input Word1 as Word WordBits AT Word1Array[1..16] of BOOL Output Bit1 As Bool . . Bit16 As Bool Code Bit1 := WordBits[1]; . . Bit16 := WordBits[16]; TheFC compiles just fine. When I put that in the OB and try and put a word from a DB in there it says that I cannot overlay an array on that type. Because of the AT the FC input is expecting a type BOOL as a formal parameterwhere I am wanting to get it a big ole fat 16 bit word. I am probably messing something up but again if someone has already accomplished this on a s7-400 with tia v11 sp2 I am all ears.
Timmy Posts: 41 Rating: (0)
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8/16/2012 1:42 AM	Rate (0)
Timmy Posts: 41 Rating: (0)	I tried the AT in SCL FCby doing the following (shorthand version): Input Word1 as Word WordBits AT Word1Array[1..16] of BOOL Output Bit1 As Bool . . Bit16 As Bool Code Bit1 := WordBits[1]; . . Bit16 := WordBits[16]; TheFC compiles just fine. When I put that in the OB and try and put a word from a DB in there it says that I cannot overlay an array on that type. Because of the AT the FC input is expecting a type BOOL as a formal parameterwhere I am wanting to get it a big ole fat 16 bit word. I am probably messing something up but again if someone has already accomplished this on a s7-400 with tia v11 sp2 I am all ears.
Timmy Posts: 41 Rating: (0)
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