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Pulse generator in STEP7

Created by: GSHADURA at: 7/31/2009 1:06 PM (5 Replies)

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7/31/2009 1:06 PM	Rate (0)
GSHADURA Experienced Member Joined: 7/31/2009 Last visit: 1/29/2025 Posts: 8 Rating: (0)	Would someone here be so kind to advice me if the part of STEP7 programm will funktion reliably. The idea is to make this part generate pulses as long as it has 1 at bool income. And is there some standard function like this? I'm beginner in STEP7 programming, so sorry if my question might be too simple. Thahks. PS Found the same question here /tf/WW/en/Posts/11300 But what about FBD? It would be clear to me cause STL is mystery for me. Attachment OB.JPG (1999 Downloads)
	Last edited by: ELECTRORAT at: 7/31/2009 1:21 PM
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7/31/2009 10:32 PM	Rate (2)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 4/4/2025 Posts: 4406 Rating: (1480)	Hi, . if you are flexible in the requirements of time basis, I suggest you use the clock memory. Set a byte in the CPU properties. Each bit has a independent frequency.
	Denilson Pegaia Siemens Industry Sector Technical Support
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This contribution was helpful to 2 thankful Users GSHADURA AutoGen_6066894

8/1/2009 8:32 AM	Rate (2)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	HI ELECTRORAT i Agree with pegia that clock memeory in the cpu can be used to generate pulse bit I have attached the screen shot as on how to do it I have also attached the step7 project in which i have used SFB 4 to generate a 1 s pulse Hope this will help Best regards Tagolover Attachment pulse_gen_1.zip (1886 Downloads)
	Jazz
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This contribution was helpful to 2 thankful Users GSHADURA onedev

8/14/2009 11:44 AM	Rate (0)
GSHADURA Experienced Member Joined: 7/31/2009 Last visit: 1/29/2025 Posts: 8 Rating: (0)	Thanks a lot to both of you. As I found no description of "Memory Clock" in Bergner's book, I'd like to explain how it works (for same beginners as I am). So at CPU properties you specify "Memory clock" byte for example 40. So each bit of M40 byte alternates from 0 to 1 with predifined frequency: from 10 Hz (M40.0) to 0.5 Hz (M40.7). Just connect the one you need to output or any logic gain.
	Last edited by: ELECTRORAT at: 8/25/2009 12:56 PM
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9/2/2009 7:58 AM	Rate (0)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	Hi glad to be of some help bye for now
	Jazz
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8/30/2019 11:57 AM	Rate (1)
Piotr.M Platinum Expert Joined: 6/24/2013 Last visit: 4/16/2025 Posts: 1678 Rating: (431)	Hi to do a pulse with any time setting: ENABLE Txx Txx ----\|\|-----------\|\\|---------------(SD) S5Txxxms // pulse interval this produces pulse which lasts one scan to extend the pulse use 2 timers - base and pulse timer NW1 Txx Tyy ----------------\| \|---------------(SE) S5Tyyyms // pulse duration NW2 ENABLE Txx Txx ----\|\|-----------\|\\|---------------(SD) S5Txxxms // pulse interval NOTE: Tyy network MUST BE FIRST how does it work the Txx creates a one-scan pulses when Txx activates Tyy triggers and is on for pulse duration Pulse Duration MUST be shorter than pulse interval! to use the pulse interrogate Tyy Tyy ----\|\|----- ... where Txx and Tyy are S5Timers (different mumbers i.e. T10, T11)
	Last edited by: Piotr.M at: 08/30/2019 11:58:54
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