A, CNC and PLC difference:
1, the use of different:
CNC computer numerical control of the use of: the use of a dedicated program can be stored in the computer to perform some or all of the basic digital control functions of the NC system. Programmable Logic Controller (PLC), used for automation control of digital computing controller, can be loaded into memory at any time control instructions for storage and execution.
2, the composition of different:
CNC computer numerical control using a dedicated computer and interface circuits, the realization of multiple CNC equipment action control, including hardware and software in two parts. Programmable controller by the CPU, instruction and data memory, input/output interface, power supply, digital to analog conversion and other functional units.
Two, CNC and PLC connection:
CNC system generally includes the following parts: central processing unit CPU, memory (ROM/RAM), input and output devices (I/O), operator panel, display and keyboard, paper tape perforator, programmable controllers, etc. PLC (Programmable Controller) is part of the CNC system.
Expanded Information:
Related Applications of PLC:
1, open-loop control: The open-loop control of switching quantity is the most basic control function of PLC. PLC's instruction system has a powerful logic operation ability, it is easy to realize timing, counting, sequence (step) and other kinds of logic control methods. Most PLC is used to replace the traditional relay contactor control system.
2, digital control:
Control system with a rotary encoder and pulse servo device (such as stepper motors), the PLC can be used to achieve the function of receiving and outputting high-speed pulses to achieve digital control, the more advanced PLC has also been developed specifically for the digital control module to achieve the function of interpolation of curves, and recently introduced a new type of motion unit module, but also provides a digital control technology programming language. Digital control technology programming language, so that the PLC to achieve digital control is more simple.
Baidu Encyclopedia - Computer Numerical Control
Baidu Encyclopedia - Programmable Logic Controllers