Multiple Pump PID Control

I am using a Modicon Momentum PLC to control (3) SQD Altivar 58 drives running pumps. The pumps are used to control water pressure. There are (6) 4-20ma inputs from pressure sensors in individual zones. Each zone has a pressure setpoint and the system will control the pressure based on the lowest zone pressure. I have used the PID2 block previously to control a similar system with a single pump, but never 3. I could used some help with the ladder logic if anyone would have a sample. You may contact me off list at [email protected]

Thanks!