Quality of service for CAMX middleware

Computer-aided manufacturing (CAM) using extensible markup language (XML) (CAMX) standards are enabling the vision of the plug & play factory for the electronics production industry. One of the implementation challenges of CAMX-message-oriented middleware for device and system communication is that of providing quality of service at the message layer. This paper analyses processes and traffic models in CAMX production environments and proposes an abstract model for quality of service. An effective implementation of this infrastructure is analysed through simulation in order to validate the proposed approach to quality of service. An approach to map quality of service at the CAMX layer to the network and data-link layers is also presented.