I am trying to put together a program for a control valve and scale combination. I will be using a ML1100 PLC, a 1762-IF4, and a 1762-OF4. I will have a Mettler Toledo IND560 scale head with a 4-20mA output module. Will send the 4-20mA signal to the 1762-IF4 input module to get my reading from the scale. I will have a HMI touchscreen so the operator can enter the amount of product to add to the tank. This number will go into the PLC and subtract from the scale value to give you the stop amount to get to. I will be sending a 4-20mA signal out to a control valve to control the flow of the liquid. Will be using PID to close the valve the closer you get to setpoint. I have never used Allen Bradley analog output modules before so I am not sure about the scaling on them. Does anyone have an example of something like this? Or an example of an analog output ladder diagram? Any help would be greatly appreciated.