Security system based on CAN bus in accelerator control

Controller Area Network (CAN) is widely used in industrial control. In this paper, as an item of R&D of Shanghai Synchronous Radiation Facility (SSRF), a PC board which works as the interface between the PC-bus and CAN bus has been designed. CAN control module, a kind of electronic-magnetic lock, has been developed successfully. The software, written in C++ and assemble language, gives a friendly user interface. Under control of this software the PC board working together with a few sets of control modules installed on the doors, makes up a security system. The system can be used to control all the entrance for the accelerator hall to ensure accelerator radiation safety. The system has been tested in the laboratory environment. The PC machine responds to the 'open door' requirements from the doors in time and records the 'open door' events on the disk. It can also lock all the doors when the accelerator is running. The number of entrance in the system can extend to 16 under the current design. High performance of CAN bus can be evaluated with the system.