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Generating diffrent wave forms

Created by: Jazz_M at: 5/27/2011 9:01 AM (10 Replies)

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5/27/2011 9:01 AM	Rate (0)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	Hi all well i want to generate say step waveform , sinewave, saw tooth wave form etc , so i like some ideasand ways of programming the same. Say i give a analog value say 50 then the value should increase and decrease along if step waveform is selected. I tried to do it but the step out put is little outof form ...
	Last edited by: Tagolover at: 5/27/2011 9:03 AM Last edited by: Tagolover at: 5/27/2011 9:02 AM Jazz
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5/27/2011 9:10 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (997)	If you need higher frequencys, you will have no chance without extra hardware. But if frequency is low, it is nor problem to do sinus - wave and a lot of other things. Do caluclation in time - interrupt (OB35ff)
IBN-Service Posts: 8946 Rating: (997)
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5/27/2011 9:41 AM	Rate (0)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	Hi Thank you for your reply, I do not have any system or IO connected it is just to test a system only.
	Jazz
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This contribution was helpful to 1 thankful Users AutoGen_927312

5/27/2011 10:20 AM	Rate (0)
Niranjan Prasad Posts: 691 Rating: (36)	Hey Have try the attached function for creating sine waves For Step , you can increment/Decreement the values after some fixed interval times. For Ramp, Just increase/Decrease every Scan Others you can combine your own logic Attachment Float_Function.gif (1273 Downloads)
Niranjan Prasad Posts: 691 Rating: (36)	Last edited by: Shar at: 5/27/2011 12:09 PM Sorry forgot to add Attachment
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5/27/2011 11:54 AM	Rate (0)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	Hi shar there is not attachement, Please attach the same.
	Jazz
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5/27/2011 12:11 PM	Rate (0)
Niranjan Prasad Posts: 691 Rating: (36)	Now you have the Attachment Attachment Float_Function.gif (656 Downloads)
Niranjan Prasad Posts: 691 Rating: (36)
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5/27/2011 1:22 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 9/25/2023 Posts: 6822 Rating: (1349)	Tagolover well i want to generate say step waveform , sinewave, saw tooth wave form etc , so i like some ideas and ways of programming the same. According to Signal and System therory , a Signal has some properties that can be varied to create different type of that type of signal.As , I may remember, amplitude and frequency are the crucial properties of a signal. So, if I were you, I would ask my question like this: "I want to make a pulse train with fixed amplitude and variable frequency which is controlled by an analog signal." or " I want to make a sawtooth waveform with a fixed (or variable) frequency in which amplitude is limited to a high limit or can be amplified or attunuated by a factor " " I want to make a sinusoidal waveform with a fixed (or variable) frequency in which amplitude is limited to a high limit or can be amplified or attunuated by a factor " Tagolover Say i give a analog value say 50 then the value should increase and decrease along if step waveform is selected. You can check this, this function is provided by SIEMENS on modular PID controller and output of FB58. Pulse-width modulation Please give us clear discription of your signal and its properties. regards
	Demo Channel on Youtube
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5/27/2011 5:06 PM	Rate (0)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	Hi Thank you for your reply, well i do not have an application right now, I was just thinking for such a concept, so that if an application comes we can use it. Dear HDHOSSEINI Well i searched Wikipedia and found the same page that you had linked , I just thought some one would have thought the same as me.... I Hope.... Any ways shall get back when it is ready.
	Jazz
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5/27/2011 6:04 PM	Rate (0)
gre_m Posts: 947 Rating: (45)	Hello for receive high frequence use modul (as sample from et200s), or 3xxC, or CPU224 With PWM - output (Pulse width Modulation). For receive sine from square you need hardware filter.
gre_m Posts: 947 Rating: (45)
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5/27/2011 6:06 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 9/30/2023 Posts: 12153 Rating: (2624)	Hello Tagolover; Have you heard about OSCAT.de librairies for the S7 PLCs? They are open-source, freely downloadable and present many useful functions not available directly through the Simatic Manager. The functions and comments areavailable in German, but there is an English version of the user manual; I have prepared an extract from the chapter on Signal; Generators that you will find in attachment. Hope this helps, Daniel Chartier Attachment oscat_basic_doc_332_SignalGen.pdf (1170 Downloads)

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This contribution was helpful to 1 thankful Users Ehsan_Shiraz

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