Design of the distributed architecture of a machine-tool using FIP fieldbus

In this paper we propose a distributed control system based on FIP fieldbus. It is applied to machine-tool as a replacement for the traditional CNC (Computerized Numerical Controller). The system is composed of a set of microprocessor-based modules (PCs, motion controllers, I/Os, ...) interconnected by FIP real-time network. The main idea is to enable each module to be intelligent improving thus the flexibility and the fault tolerant capability of the whole system. Each module being a sub-control system, accomplishes its own control task some of them for motion control and others for evaluating sensors and regulating actuators. The communication (information exchanges and synchronization) among these modules is ensured by FIP. This system allows both task distribution as well as equipment topological distribution. We discuss some distribution criteria and describe an experimental implementation