What is CNC and PLC?

Question

Im starting on my mechanical engineering technology degree and was wondering what I should get extra training on CNC or PLC?

What is CNC and PLC used for?

Answer 1

CNC is used to control machine shop equipment. Design programs such as SolidWorks or AutoCadd Inventor are used to create a 3d object in the computer. Another program then translates the Cadd design into a sequence of instructions a milling machine for example will use to move the cutter.

A programmable logic controller is a type of microcontroller or computer hardened for industrial use. Its purpose it to control a process like an assembly line or a water treatment plant.
A PLC will have Input/Output circuitry to handle control signals from as few as 10 to several hundred electrical signals. Signal voltages may be either digital or analog and may be any of the following:
4 to 20 mA
0 to 5 volt DC
0 to 10 volt DC
120 VAC
These signals which come from sensors or switches are used by the PLC to process the logic of its control program and output control signals to start/stop motors, actuators ect...

If you are going to design machines, assembly line equipment or some type of control system I would get PLC training.

If you are going to design mechanical hardware such as a machined widget go for the CNC and machine shop training.

Answer 2

CNC (Computer Numerical Control) is a particular application usually to control a multi axis machine tool such as a milling machine or a lathe but also could be a tube bending machine punch press or similar. The CNC controller is usually a purpose built controller using a micro computer but could be a general purpose computer or a PLC. The forerunner was NC (Numerical Control) before computers were readily available, it used solid state logic and relays, timers etc to provide the application.

A PLC (Programable Logic Controller) is a general purpose logic controller specifically designed to allow the user to create their own application. They select appropriate I/O (Inputs Outputs) and perhaps function modules for purposes such as communications and multi axis servo control and program the PLC to perform the required functions.

https://www.electrikals.com/

Answer 3

Hi. CNC stands for Computer Numeric Control and PLC is a Programmable Logic Controller. Hope this helps. : http://www.answers.com/main/ntquery?s=Programmable%20Logic%20Controller&gwp=16
http://www.answers.com/topic/numerical-control

Answer 4

CNC = 'computer numerically controlled'
PLC = 'programmable logic controller'

You should probably get training in both.


Doug