Random numbers 1

[Nick90]

Hi,

Can any of you clever chaps give me(lazy I know!) structured text code that will generate a pseudo random number between 1 and 10?

Thanks

 

[xyzz]

If you do not need the random number often, use the seconds lower digit of a real-time clock.

 

[OldPfart]

Structured text? There is a very good one in ladder at

http://forum.mrplc.com/index.php?act=Downloads&CODE=02&id=161

It has been designed using Omron but should be adaptable.

 

[Nick90]

Thanks for your replies,

I'll try and get the ladder version to work.

 

[jonesy29847]

I love ST programming, what processor are you using, I'll give it a shot.

 

[xyzz]

By the way, what may be a real life PLC application that requires a random number generation?

 

[OldPfart]

The generation of random numbers for timers. I use them regularly to insert different values into timers for swimming pool water features. Sometimes the randomly generated timer values represent 2 decimal places. Sometimes minutes. Depends on the water features at hand.

 

[Nick90]

Thanks everyone,

These random numbers will be used for timer values. Its for a security lighting project I'm working on.

The PLC is a WAGO 750-841 and the software I'm using is CoDeSys.

Happy New Year.

 

[OldPfart]

Nick, did you leave a request here for a simpler version of a number generator? If so, leave it again and I will see if I can post it somewhere for you to pick up.

 

[Nick90]

OldPfart, yes I did request your simpler version.
Thanks

 

[OldPfart]

Nick, I have not forgotten you. Just had one end up and the other end down (inverted). Not a pretty sight.

Will see if I can set something up for you tomorrow.

Bob

 

[OldPfart]

Nick, still got head down and a*** up. Have not forgotten you.

Pleas be patient for another day or two.

 

[knji]

Nick90,

Still looking for help with random numbers? In MATLAB, use the command rand. I beleive C/C++ also have the function rand().

 

[hrc]

As I was reading the replies...someone asked....what would you use it for...and bingo...olphart said for water feature timers. Whoa...scary...that is EXACTLY what I used it for as well. Did a control system for a water park feature that would do a random time for the events to occur.

http://www.cherry-hill.com/GrantsGulch.htm

fun project....