Computer numerical control (CNC) systems use a computer to store and perform numerical control (NC) functions with stored programs, rather than physical hardware. CNC systems can be hybrid, using computers for some functions while retaining hard-wired logic for others like feed rate generation, or straight CNC where computers perform all NC functions. Distributed numerical control (DNC) connects multiple CNC machines to a central computer through direct connections, allowing the sharing and real-time distribution of part programs between machines from a common memory.

1. Computer And Microcomputer in CNC,DNC
JAGANNATH
M.Tech(CIM)
1MS16MCM08

2. Computer Numerical Control
• Conventional hard- wired NC controller unit replaced by computer.
• NC system that utilizes stored programs in a dedicated computer to
perform some or all NC functions

3. CNC

4. Functions of CNC
• Hybrid CNC –Hard-wired logic circuits for functions like feed rate
generation , circular interpolation etc. in addition to computer Mass
production of circuits and less expensive computer
• Straight CNC – Computer to perform all NC functions

5. Hybrid CNC

6. Straight CNC

7. NC, CNC and DNC

8. Distributed Numerical Control System
• DNC is a manufacturing system in which a number of machines are
controlled by a computer through direct connection and in real time
• DNC is a system connecting a set of Nc machines to a common
memory for part program or machine program storage with provision
for on demand distribution of data to machines.

9. DNC configuration

10. DNC system without satellite computer

11. DNC system with satellite computer