Design Of Laser Mark Control System Based-on CAN Bus

The project rooted in a certain Laser Marking whole setting company of WuHan. And the control system reconstruction is the essential part of the project.This paper has done some research to promote the capability of the Laser marking control system based on previous Laser machine. In order to solve the control problems efficiently resulted from the low control precision, complexity of the control technics. Through the advanced field bus to realize the Laser marking control system , improve some control parameters and Laser marking quality, and reduce the hardware cost at the same time.The interface of field bus designing, including the PC interface and CAN bus nodes interface, and laser mark control part designing will be the emphasis in this paper.After analyze several kinds of common laser mark control system, choose CAN as the communication protocol, and configure the system with PC and microchip. The CAN bus basic architecture and the CAN bus adapter and control node design precept are given in details, which composing the CAN bus communicate web and improve the signal communication speed and stabilization. The node card includes the several Laser marking control units. Digital signal in and out unit is the ON/OFF switch of Laser machine. PWM circuit design unit is taken to control the laser power. The Digital-Analog transmission unit is designed to control the step motor precision and time-delay circuit design and GAL programming units are given in details. And graphic arithmetic is also described at last.This paper put forward a new control ideal for the laser mark control, and the system has been put in use in March 2005, meets the need of Laser marking and works very well, obviously improve the marking precision and control stability. It not only reflects the rationality, practicability and advancement in practice, but also has the value of engineering reference.