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Bit Toggle S7-300

Created by: Catch Me If You Can at: 7/23/2010 6:33 PM (8 Replies)

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7/23/2010 6:33 PM	Rate (0)
Catch Me If You Can Regular Member Joined: 10/3/2008 Last visit: 3/25/2021 Posts: 13 Rating: (1)	Hi Frnds, How to toggle a bit in S7-300. Am using CPU-314 for my application. i need to toggle a bit for every cycle. say for example Cycle 1: M 4.0 needs to be set Cycle 2: M 4.0 needs to be Reset Cycle 3: M 4.0 needs to be set and it goes on. I know that we can use INVI Command to Convert a 16 Bit value. The bits in the 16 bit Int will be set to 1 if it is 0 and vice versa... Thanks In Advance
	Last edited by: catch me if you can at: 7/23/2010 6:35 PM
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7/23/2010 6:51 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 1/26/2025 Posts: 12331 Rating: (2702)	Hello CMIYC; You could have a look at the NOT instruction in LAD (bit instructons), which would invert the value of a single bit depending on your logic. ---\|NOT\|--- Invert Power Flow However, you should be aware that you have 2 distinct flip-flop instruction already available in your program editor: • SR Set-Reset Flip Flop • RS Reset-Set Flip Flop Look for information on how they work in the online help. Hope this helps, Daniel Chartier

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7/23/2010 8:06 PM	Rate (2)
IBN-Service Posts: 8946 Rating: (999)	AN M4.0 = M4.0
IBN-Service Posts: 8946 Rating: (999)
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This contribution was helpful to 1 thankful Users Sybiryak55

7/24/2010 6:26 PM	Rate (0)
Catch Me If You Can Regular Member Joined: 10/3/2008 Last visit: 3/25/2021 Posts: 13 Rating: (1)	actually am doing it in STL. shall i write as follows A DB10.DBX 0.0 S DB10.DBX 0.0 AN DB10.DBX 0.0 R DB10.DBX 0.0 Is there any other simple way to do that. because i have to do these for many bits at different instance of time.

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7/25/2010 6:11 AM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 1/24/2025 Posts: 3032 Rating: (1059)	Catch Me If You Can actually am doing it in STL. shall i write as follows A DB10.DBX 0.0 S DB10.DBX 0.0 AN DB10.DBX 0.0 R DB10.DBX 0.0 I wouldn't dear Catch Me If You Can, as it will not work this way. Catch Me If You Can Is there any other simple way to do that? There sure is and it is the way IBN-Service described which will of course also work with your DB bit as follows: [code]AN DB10.DBX 0.0 =DB10.DBX 0.0 [/code] Catch Me If You Can because i have to do these for many bits at different instance of time. Not too sure why you would need to do this for many different bits. I'd only create one bit (typically at the start of OB1) that is ON for one scan, OFF for the next, ON for the next and so forth and use this bit wherever I would need it in the program. 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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7/25/2010 9:36 AM	Rate (0)
Catch Me If You Can Regular Member Joined: 10/3/2008 Last visit: 3/25/2021 Posts: 13 Rating: (1)	Thanks Alot Fritz. Ill make it clear. am a beginner for this. Actually how exactly it works (IBN Service). AN M 4.0 = M 4.0 Initially M 4.0 will be zero. and how it goes on.. My application is as follows, Im using TP 177B with USB port. i have generated 20 report in TP. i have to trigger a particular report according to the requirement. There is no way other than toggle a bit in TP. So i have created 20 different Data bits for generating a report. So the TP will output the Report to the Printer for every cahnge of value. Thanks In Advance.

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7/25/2010 1:04 PM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 1/24/2025 Posts: 3032 Rating: (1059)	Hello again Catch Me If You Can Catch Me If You Can Ill make it clear. am a beginner for this. Actually how exactly it works (IBN Service). AN M 4.0 = M 4.0 Initially M 4.0 will be zero. and how it goes on.. "AN M 4.0" checks whether the state M 4.0 is "0". If this check is True (i.e. M 4.0 is 0) it sets the RLO (Result of Logic Operation) to 1. If this check is False(i.e. M 4.0 is 1) it sets the RLO (Result of Logic Operation) to 0. "= M 4.0" simply assigns the status of the RLO to M 4.0 and as such M4.0 toggles its state every scan (or every time this piece of logic is executed). Note too that F1 will give you context sensitive help for every instructions. Catch Me If You Can My application is as follows, Im using TP 177B with USB port. i have generated 20 report in TP. i have to trigger a particular report according to the requirement. There is no way other than toggle a bit in TP. So i have created 20 different Data bits for generating a report. So the TP will output the Report to the Printer for every cahnge of value. I see, in that case you can still use the proposed logic for any bit that you need to toggle, but need to bear in mind that a cyclic toggling will be way too fast for the TP to see the change of state (and I doubt you want to trigger a report every OB1 scan). The way to go here is to execute this toggle logic based on a condition (e.g. jump over if when not needed and run trough it once when you need to toggle the bit).
	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 quark

4/18/2012 1:55 PM
eng_semsem Experienced Member Joined: 5/1/2009 Last visit: 5/23/2021 Posts: 144 Rating: (1)	this code will be active reset all time but can using this code AN M0.0 = M0.0 or A I0.0 FP M0.0 X Q 0.0 = Q 0.0
	Best regard Osama
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4/18/2012 2:00 PM	Rate (1)
MM1234 Posts: 270 Rating: (53)	Seems like you are two years too late, bro...
MM1234 Posts: 270 Rating: (53)
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This contribution was helpful to 2 thankful Users hdhosseini Alien Lee

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