General numerical control system based on full digital ring bus

The invention discloses an universal control system based on digital ring bus, including master equipment and slave equipment; the main equipment includes the PC (1) with digital control software and the bus controller unit (2); the slave equipment includes digital bus servo drive (3) and the PLC, and main equipment connecting with 1-24 slave equipments in serial which back to the main equipment thereby constituting a closed loop, and between the main equipment and the slave equipment transmitting data through the link connecting with physical layer and transmission media; among them, the bus controller (2) is slot structure, and connects with the motherboard based on X86 architecture through the bus interface on the motherboard, and communicates with the X86CPU on the motherboard. The invention relies on the method of industrial control motherboard plus bus controller slot, in order to improve the system expanding performance.