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how to create a simple Flip Flop ?

Created by: zouki at: 11/28/2010 6:33 PM (6 Replies)

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11/28/2010 6:33 PM	Rate (0)
zouki Posts: 2 Rating: (0)	Hello, Usually i work with 300's cpu and use the function U UN fp ... X OUT = OUT to create a flip flop bit. How can i do that with a 1200, i can only use XOR for word, dword etc... Thanks for your help. Frantz
zouki Posts: 2 Rating: (0)
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11/28/2010 7:05 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 4/10/2021 Posts: 6721 Rating: (1291)	Dear member This is the set prior and reset prior flipflop functions in STL. They can be easily converted to LAD or FBD in any binary codes even if in micro controllers.check attachment for LAD equivalent. [code]//SET PRIOR AN #RESET A( O #START O #MEMORY ) = #MEMORY //RESET PRIOR O #START O( AN #STOP A #MEMORY ) =#MEMORT[/code] regards Attachment flip.jpg (1621 Downloads)
	Last edited by: hdhosseini at: 11/28/2010 7:28 PM Demo Channel on Youtube
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11/29/2010 2:24 AM	Rate (0)
fritz Diamond Member Joined: 10/7/2005 Last visit: 4/9/2021 Posts: 2875 Rating: (970)	Hello zouki STL is(for unknown reasons as far as I'm concerned) notpossiblein TIA Portal V10.5 or current S7 1200's so you can't directly take over you logic (it appears though thatimminentrelease ofV11 will bringSTL to at least the 300's and 400's but perhaps also 1200's). You also quite rightly determined that XOR is onlyavailable for Byte/Word or DWord types ifLadderis used (the same applies for the "normal' Step 7 too by the way). While you could manually program a Ladder bit based XOR, the good news isthat you have a bit XOR element available in FBD which should help implementing your toggle logic in the 1200. Attached is an example screendump of it and I hope this helps. Attachment FBD Toggle logic (Tia Portal V10.5).jpg (1769 Downloads)
	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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11/29/2010 7:22 AM	Rate (0)
zouki Posts: 2 Rating: (0)	hello dear Fritz. Thanks for your help, I never used the FBD... only STL or sometimes if it's easyer to understand LADDER..., It's quite special to have some functions in FBD and not in LAD... but.. thanks to you I have my issue... Thanks all Frantz
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10/13/2017 10:42 AM	Rate (0)
zapla1 Regular Member Joined: 5/24/2015 Last visit: 7/28/2020 Posts: 42 Rating: (0)	Rights missing Unfortunately you do not have the required rights for the performed action Please contact the moderator. Attachment 1.jpg (737 Downloads)

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10/13/2017 11:10 AM	Rate (1)
Piotr.M Platinum Expert Joined: 6/24/2013 Last visit: 3/15/2021 Posts: 1447 Rating: (352)	Hi in LAD (I hate FBD;-) it could be done like this (code can be put in the FC) I_TOGGLE IQ_TOGGLED_BIT BTmp ---\|P\|--------------\|\\|----------( ) IQ_FP_TOGGLE \| \| BTmp IQ_TOGGLED_BIT \|----\| \|----------(S) \| \| BTmp IQ_TOGGLED_BIT \|----\|/\|----------(R) BTmp is declared as Temp I is input IQ is In/Out the IQ_FP_TOGGLE must be linked to a Marker or STAT or DB bit - different one for every FC call. You can add interlock to force toggled bit reset when for example run conditions are not met.

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This contribution was helpful to 1 thankful Users Akachi

10/13/2017 1:40 PM	Rate (0)
CS Moderator Moderator Joined: 9/1/2005 Last visit: 4/9/2021 Posts: 3951 Rating: (187)	Hello zapla1, zapla1 Rights missing Unfortunately you do not have the required rights for the performed action Please contact the moderator. Please keep me informed what you have tried to do. This would be helpful to answer the question why you have received this message. You could share this information public or contact me via personal message. Best regards CS Moderator

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