Design and Implementation of Process Controller for Direct Digital Control on FPGA

In manufacturing processes it is invariably required to control certain process parameters to maintain a stipulated level of quality. Process control really means that all the parameters of the process are kept at their respective set values subject to permissible deviation from the set or reference value (i.e. within permissible tolerance). The process controller operates on the error signal using a particular control algorithm such as PI (proportional integral) or PD (proportional derivative) or PID (proportional integral derivative) and generates an actuating signal for the control element. This paper scrutinizes the various design methodologies with a focus on industrial process control system. Further a design of process controller for Direct Digital controller is realized to control multiple process parameters, which is then implemented on Xilinx FPGA (XC3S-500E). The approach mainly focuses on finding a off the shelf single solution for controlling multiple process parameters.