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how to use only one push button to on/off the output

Created by: Kutti at: 9/13/2010 5:30 PM (8 Replies)

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9/13/2010 5:30 PM	Rate (0)
Kutti Advanced Member Joined: 4/25/2009 Last visit: 1/14/2013 Posts: 41 Rating: (0)	hi guys, please guys anybody tell me how to use only one push button to on/off the output in S7-400. regards, Kutti

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9/13/2010 5:48 PM	Rate (0)
dchartier Diamond Expert Joined: 9/27/2006 Last visit: 10/15/2018 Posts: 7778 Rating: (1576)	Hello Kutti; What you are aslking for is a "toggle" signal, or a "flip-flop" logic. You can search for these terms on the forum, and see what other members have asked on these subjects abd what help they recieved. For example, there was an interesting discussion recently involving memebers IBN-Service and Fritz: Bit toggle in S7-300: /tf/WW/en/Posts/46539 There are also flip-flop instructions built in the Step 7 instructions, namely RS and SR, in the bit instructions. Hope this helps, Daniel Chartier

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9/13/2010 8:48 PM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 10/15/2018 Posts: 10192 Rating: (1141)	Hello Kutti, Or to use Daniel' explanation from Help me ! thread. Best regards, Hristo Mihalev

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9/15/2010 6:19 PM	Rate (2)
bit7 Advanced Member Joined: 7/26/2008 Last visit: 10/8/2018 Posts: 29 Rating: (6)	Hi Umencho, the shortest code I have come across for this is: A I 0.0 FPM 0.0 X Q 0.0 = Q 0.0 You can test the code with PLCSIM and see if you agree.

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This contribution was helpful to 2 thankful Users AlexG68 Stylle

9/16/2010 8:45 AM	Rate (0)
bidnetvåga Member Joined: 7/7/2010 Last visit: 1/27/2011 Posts: 6 Rating: (0)	Relly neat coding Almost embarrased that I haven't figured this one out myself after xx years of PLC programming
	Last edited by: bidnetvåga at: 9/16/2010 8:46 AM
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8/29/2012 12:39 PM	Rate (1)
GaJEnDrA D S Bronze Member Joined: 8/9/2011 Last visit: 9/17/2018 Posts: 297 Rating: (16)	Hi all My aim is to control Q bit. I have checked and it works?? Attachment New Bitmap Image.JPG (2492 Downloads)
	"Any intelligent fool can make things bigger, more complex. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction.":):)
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8/29/2012 9:03 PM	Rate (1)
bit7 Advanced Member Joined: 7/26/2008 Last visit: 10/8/2018 Posts: 29 Rating: (6)	Hi Gajendrads, it is not necessary to lose the elegance of the STL solution just because you prefer to work in ladder. The solution however is slightly complicated by the fact that ladder does not allow for exclusive or (XOR) operation at bit level. I simply used the (double) word XOR operation, mapped the edge into the double words and mapped the result to the output. Off course all the other bits can be used in a similar way. Attachment Toggle.jpg (2220 Downloads)

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This contribution was helpful to 3 thankful Users GaJEnDrA D S AlexG68 U_89052a17-2b5a-4...

8/31/2012 5:47 PM	Rate (0)
GaJEnDrA D S Bronze Member Joined: 8/9/2011 Last visit: 9/17/2018 Posts: 297 Rating: (16)	Hellow Bit7 I really dont know what is STL and its not supported by V11 by the way . I tried to do something with what i had . You can have many solutions for a particular problem in many cases and i had not gone through the discussion above either. In your case the program looks simpler for you but for the CPU lots of other things to be done just to execute one XOR block which adds to the scan cycle time. In addition you are sacrifising 2 double words just to control a bit which could be used somewhere else otherwise .. Thanks & Regards
	"Any intelligent fool can make things bigger, more complex. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction.":):)
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7/7/2013 11:11 AM	Rate (0)
SMHZ Bronze Member Joined: 10/19/2012 Last visit: 4/20/2016 Posts: 313 Rating: (9)	you want the output to be latched or unlatched?

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