Control logix PID

hello ,
I am doing programming for one process
using controllogix PLC , its haveing PCV(Process control valve)4-20 ma
i have two condition
1 . if Operator chages PID Mode from Auto to manual during running
how to handled this condition in prog

2. if he changes to maual to auto ...//........

how the rammping factor work for it?


Thanks
sandeep patil

sandeeppatil1980,

There is an internal bit for Manual and Automatic in the PID function. You program must set this bit as needed. When set to Manual, your ControlLogix program must move the process Manual Setpoint value directly to the PID Control Output (CV) location. When in Auto mode, the PID function will compute the Control Value based on the Tuning Parameters that you have set.