I'm need some help writing a program to control 4 A-B 160 drives with a SLC 5/03, using rslogix 500, using a panelview 550(touchscreen only), using panelbuilder 32 software . We are presently controling the drives using 5k ohms pots. We want to take out the pots and use presets according which recipe is chosen. We want to use 0-60 Hz(that is what the operators are use to) displayed on the PV. We also want to be able to manually inc/dec the output if needed. We are using 4-20mA output to the drives. I'm not knew to plc's, but I use them for troubleshooting and can write simple programs. I don't really understand how to use the scaling parameters (rate and offset), or is there a better way to write it not using the scl instruction? I have read the help section on rslogix 500, but I think that if had a good example I could understand it better.