The current project involves resetting boiler temp higher with a drop in outdoor temp. This makes the slope negative. I have the y=mx+b thing down OK. The math I need to accomplish is "boiler setpoint = (-1.09)(outdoor air temp) + 180". The schedule works on paper. I have the AI module set up to use BCD values and the input values are accurate as they are displayed in the data view as well as on the LCD panel on the PLC. Any help with this will be appreciated.