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Random Numbers

Created by: whutch at: 7/22/2013 6:49 PM (8 Replies)

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Thanks 5

9 Entries

7/22/2013 6:49 PM	Rate (0)
whutch Posts: 2 Rating: (0)	Hello All I have a specific purpose where I need to have a pseudo-random number generated. I don't believe there is a function to do so. Is there a binary or integer value that could be read that would seem to be random to be used as a seed ? Thanks Wendell Hutchings
whutch Posts: 2 Rating: (0)
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7/22/2013 6:52 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	There are a lot of possibilities, but a "high Quality" random number can not be done so easily.
IBN-Service Posts: 8946 Rating: (1000)
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7/22/2013 10:40 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/13/2026 Posts: 16358 Rating: (2522)	whutch Hello All I have a specific purpose where I need to have a pseudo-random number generated. I don't believe there is a function to do so. Is there a binary or integer value that could be read that would seem to be random to be used as a seed ? Thanks Wendell Hutchings See image for very simple non-tested pseudo random number generator. You can also look at the oscat open source library for examples. Attachment C:\TEMP\pseudo_random_gen.lad.jpg (3179 Downloads)
	science guy
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7/23/2013 9:34 AM	Rate (0)
Alexor Posts: 3 Rating: (0)	If you don`t need random function inside PLC and just want to test something, you may try my freeware utility. There is video tutorial (http://www.youtube.com/watch?v=ZpsvQrQqfSc) how to generate random number for S7-PLCSim. It is also possible to use this for “real” PLC connected over OPC interface.
Alexor Posts: 3 Rating: (0)
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This contribution was helpful to 1 thankful Users alpharex

7/23/2013 12:17 PM	Rate (1)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 1/13/2026 Posts: 4446 Rating: (1487)	Hi, this thema is a "black hole" once there no end to algoritmus apprimorations when you need a"perfect random number". Tell us what you need to do with this random number, maybe it help us to find the best solution for your case.
	Denilson Pegaia Siemens Industry Sector Technical Support
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7/23/2013 8:09 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 1/13/2026 Posts: 12480 Rating: (2722)	Hello Wendell; In the following link you will find a collection of numeric calculation application for the S7 PLCs (on Step 7 software). One of the tools discussed is: Random number generator The RANDOM function is a random number generator implemented as 16-bit feedback shift register. The random numbers are in the range of -32768 to +32767.You can find doocumentation and sample codes in this Applications and Tools thread: Tool collection of functions for bit, number and mathematical operations Hope this helps, Daniel Chartier

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This contribution was helpful to 1 thankful Users IBN-Service

7/23/2013 8:55 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	dchartier ...Tool collection of functions for bit, number and mathematical operations Hope this helps, Daniel Chartier Nice selection!
IBN-Service Posts: 8946 Rating: (1000)
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7/23/2013 9:13 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/13/2026 Posts: 16358 Rating: (2522)	IBN-Service dchartier ...Tool collection of functions for bit, number and mathematical operations Hope this helps, Daniel Chartier Nice selection! I tried using it but sadly could not. This is the TIA Portal sub-conference and the linked project does not open for me.
	science guy
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7/24/2013 12:06 PM	Rate (0)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 1/13/2026 Posts: 4446 Rating: (1487)	Hi, Here there is open related the S7 V5.x program, converted toV11 Attachment Random.zip (1282 Downloads)
	Last edited by: O_Moderator at: 7/24/2013 12:25 PM attachment reattached Denilson Pegaia Siemens Industry Sector Technical Support
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This contribution was helpful to 3 thankful Users dchartier Amit_86 Marky_12

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