Systematic Approach for Scheduling of Tasks and Messages under Noise Environment

Abstract

High degree of EMI (Electro-Magnetic Interference) or noise is generated in the plant environment, where control systems consist of smart sensors, smart actuators, and controllers connected via a fieldbus. The noise generated by some devices such as high-power motors may cause communication errors and delay the successful transmission of data. Therefore, the noise condition is one of the important parameters considered in the design of a reliable network-based control system. This paper presents the scheduling method of task and message to guarantee the given end-to-end constraints under noise environments. The presented scheduling method is applied to an example of a control system that uses CAN (Controller Area Network), considering two kinds of noise models. The comparison results for each noise condition shows the importance of considering the noise condition in system design. System designers are able to design the control system, guaranteeing its requirements under a noise environment by using the proposed scheduling method.

Keywords

• Fieldbus
• Real-Time
• Noise
• Scheduling