hi random number generation

[The Plc Kid]

If you have indirect addressing make a table of time bases (random) and step through it with indirect addresses moving the integer contents to the preset of the timer.

use the plc clock if you have one and add some number to it then use that number for your random number. that should be pretty random.

 

[Lancie1]

Yes, do like PLC Kid said. Here is an example that used the S:4 word of the internal Allen-Bradley RSLogix clock. The Masked Move (MVM) instruction allows you to select the range of the random number by setting the Mask value. This is a subroutine from a past student game program developed here on PLCS.net. Each time the subroutine is called, a new pseudo-random number is generated. The Equal instruction prevents getting the same number twice in a row.

http://www.plctalk.net/qanda/attachment.php?attachmentid=10623&stc=1&d=1244000581