Isn't Logix 5000 the program for CLX? If so, CLX has a function block called FGen ("function generator").
It is somewhat similar to the one below from a different system:
See pgs 36, 37, 38 in the document below for an application example using FGEN in CLX.
http://www.t-bak.com/Process Contr...ntrolLogix.pdf
Maybe that will do it.
I suggested that several posts back but no one bit.
And it would be a lot easier if he were just using the controller you copied that graphic from, but ya can't convice folks of that...