FIELDBUS COMMUNICATION IN CONTROL SYSTEM OF FLNR

The existing computer Control System of FLNR is being renewed to fulfil the increasing requirements of the accelerator operations. The purpose of improvement is to provide the physicists with ion beams of higher stability and quality by means of higher reliability and flexibility of parameters of the accelerator. The communication is an essential component of the control system. It is a guarantee of real time data acquisition and processing. The joint work of units is possible only by use of the appropriate standards of communication between these parts. For low levels (field level), i.e. levels of industrial controllers, sensors, actuators and transducers the standard fieldbus system does not exist yet. This area develops now due to efforts of the separate companies or their groups, and yet it is not clear which of the systems will be the standard. In studying the various fieldbus choices it's apparent that the benefits are not specific to a particular protocol. The Control System Fieldbus Protocol (CtrlBUS) was developed in FLNR in 1997. It is a high-speed, multi-master device- and process-level protocol based on distributed intelligence and master-slave communication. This paper considers the concept of the CtrlBUS protocol and gives a brief description of the CtrlBUS modules based on Intel 8051 class microcontrollers.