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Ladder help

Created by: Per Olof at: 6/14/2011 2:23 PM (10 Replies)

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6/14/2011 2:23 PM	Rate (0)
Per Olof Posts: 311 Rating: (3)	Hello, What is the best way to write this pseudocode C code in ladder: if ((possitiv edge on I0) and (MW100 == 0) then { MW100 = 1 } else if ((possitiv edge on I0) and (MW100 == 1) then { MW100 = 0 } Cheers Per Olof
Per Olof Posts: 311 Rating: (3)
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6/14/2011 2:35 PM	Rate (1)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 12/2/2024 Posts: 10229 Rating: (1181)	Hello Per Olof, Check in attachment. Best regards, Hristo MIhalev Attachment Untitled1.jpg (854 Downloads)

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6/14/2011 2:46 PM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 12/13/2024 Posts: 5697 Rating: (715)	But why use a word for something that can be done with a bit? I think you need a flip-flop or toggle switch. Attached version with a M-bit. Regards, Marcjan Attachment ladder.JPG (793 Downloads)
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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6/14/2011 2:54 PM	Rate (1)
Amit_86 Platinum Member Joined: 3/18/2008 Last visit: 12/8/2023 Posts: 1750 Rating: (272)	Per Olof Hello, What is the best way to write this pseudocode C code in ladder: if ((possitiv edge on I0) and (MW100 == 0) then { MW100 = 1 } else if ((possitiv edge on I0) and (MW100 == 1) then { MW100 = 0 } Cheers Per Olof Dear Per Olof have a looked at attched example for toggle logic. Attachment toggle logic.JPG (780 Downloads)
	VANDE MATARAM.....
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6/14/2011 4:05 PM	Rate (0)
KayBee Posts: 241 Rating: (7)	Hi, Per Olof, I have suggesion, I think you are beginner in PLC programming. Look in this Link, where you can find some good resources for learning PLC Programming. Here I think you already have got your solution.
KayBee Posts: 241 Rating: (7)
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6/14/2011 4:44 PM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 12/2/2024 Posts: 10229 Rating: (1181)	Let's start from the beginning. Because the issue is placed in Step7 (TIA Portal) the things are a little bit different. But could be that the target is Step7/Step7 Lite. Please clarify it! best regards, Hristo Mihalev

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6/14/2011 8:52 PM	Rate (0)
AmirAlwaled Posts: 148 Rating: (14)	OLD Problem " One Push Button ON/OFF " In one network only I have it in first PLC course in college Attachment One Push Button ON_OFF.JPG (868 Downloads)
AmirAlwaled Posts: 148 Rating: (14)
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6/15/2011 1:06 PM	Rate (2)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 12/26/2024 Posts: 4376 Rating: (1458)	Hi, you can get some samples of simple high level logic structures in Ladder in the TIP: /tf/WW/en/Posts/57450
	Denilson Pegaia Siemens Industry Sector Technical Support
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6/15/2011 9:34 PM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 12/13/2024 Posts: 5697 Rating: (715)	Verry good tip, but the basic of ladder is the same for a 200, 300, 400 or 1200 series. Or even third party systems. the few differances are easy to learn by pressing F1. regards, marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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6/15/2011 9:52 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/23/2024 Posts: 15531 Rating: (2461)	Per Olof Hello, What is the best way to write this pseudocode C code in ladder: if ((possitiv edge on I0) and (MW100 == 0) then { MW100 = 1 } else if ((possitiv edge on I0) and (MW100 == 1) then { MW100 = 0 } Cheers Per Olof I0.0MW100 ------\|p\|------------[==]---------------\| MOVE \| M1.1\|0 1 \| MW100 \| \|MW100 ------[==]---------------\| MOVE \| 10 MW100 Many variations exist to do the requested pseudo code. The "MOVE" block moves the value into that memory location (MW100). If you simply want to toggle a bit each time I0.0 goes high, you could also use positive edge detection to toggle a bit using a hardware interrupt routine. That would have the least and most consistent latency between I0.0 going high and the toggling of the M bit. Good luck at whatever you are trying to accomplish.
	Last edited by: huggy_d1 at: 6/15/2011 9:56 PM Last edited by: huggy_d1 at: 6/15/2011 9:54 PM Last edited by: huggy_d1 at: 6/15/2011 9:53 PM science guy
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