Real Time Embedded PID Controller using ARM Controller and MODBUS Protocol

Abstract

Embedded systems are used in all aspects of modern life and examples of their use are numerous. Therefore more and more embedded system developers and system-onchip designers’ rely on microprocessor based design methodology to reduce time-to market and high performance. One of the most important hardware components of an embedded system is microprocessor/microcontroller. The embedded ARM system can be used to full-fill strict requirements of the data acquisition system, such as the function, reliability, cost, size, power consumption etc. ARM Controllers are sophisticated multiprocessor design which has RISC type architectures. ARM variants have not only their high performance and low cost advantages but also power saving features. In the industries there are no of process loops (SISO and MIMO) necessitate tuning. More than 90% of all control loops are PID. The proportional –integral –derivative (PID) controllers are designed for application where load change are expected and need control action fast and accurately. In the present paper ARM processor is used to implement Proportional-Derivative-Integral controller card for maintaining a specific level in the level control trainer. Modbus communication would be implemented between ARM processor and personal computer through serial port with help of labview.