The SLC500 RMP instruction is not available in Logix5000 ladder language. A ramp-soak instruction, RMPS, is available in Function Block.
Your program looks like its doing a ramp-soak, with a series of ramps with five second soaks (your delay timers) between.
If you don't have function block extension, or if RMPS is not suitable for your needs then you can easily create your own ramp with a timer and a CPT statement. The ramp equation is
SP = Begin + (End-Begin)/(Time.ACC/Time.Pre)
Another alternative is to program the ramp in a periodic task and simply add the correct value that corresponds to the setpoint rate and your task period to your setpoint.