In order to make the most of system resource and improve system performance in Ethernet-based computer numerical
control (CNC) system, it is very necessary to establish the performance analysis model and further adopt the codesign
method from the control, communication and computing perspectives. Analyzing system architecture, time
characteristic parameters of controlloop, model framework, etc. we proposed a simulation analysis model for realtime
Ethernet-based CNC system. This model includes the timing effects caused by the implementation platform in
the simulation. The key to establishing the model is accomplished by designing the error analysis module and the
controller nodes. The proposed model is helpful for CNC system development.