In order to provide with input interface for the designed self-adaptive control system to modify PID regulating parameters in real-time

An advance PID function module for FCS165 fieldbus control system has been developed

three operation modes

namely automatic control mode

tracking mode

and compulsory mode

being given by the said module.Under condition of three said modes

if the controlled values is exceeding limits

they can be confined from begining to end within a set range between upper and lower limits of the output

and a special treatment in integral links has to be carried out in real time for each operation period

such as anti-saturation in the integral

and bumpless switch over etc..