PLC & CNC diff

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Nishant Commentator Join Date: Aug 2007 Location: INDIA Posts: 58	PLC & CNC diff 08/16/2007 7:10 PM
	differance between between cnc & plc control __________________ TARGET - Where many stop thinking, some start from there. Tenacity to get target helps to WIN.
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Hendrik Guru Join Date: Jan 2007 Location: Centurion, South Africa Posts: 3921 Good Answers: 97	#1 Re: PLC & CNC diff 08/17/2007 1:48 AM
	CNC stands for Computer Numerical Control - The intention is to have the computer control the movements and actions according to the requirements of a designer. it is versatile and no 2 programs have to be the same. PLC control can also be simulated. PLC - (I think) Programmable Logic Control - Intended for controlling equipment depending on the status of sensors. Personally I think the 2 grew closer to each other. __________________ Never do today what you can put of until tomorrow - Student motto
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Stirling Stan Guru Join Date: Nov 2006 Location: KnoxTN Posts: 1485 Good Answers: 6	#3 In reply to #1 Re: PLC & CNC diff 08/17/2007 11:38 PM
	"PLC - (I think) Programmable Logic Control - Intended for controlling equipment depending on the status of sensors." It is usually a PIC, Programmable Integrated Circuit module for controlling a few actions. It is a discrete item. CNC is the program for a computer to control a multi-function machine to produce complex machining operations. Depending on the machine the program can be very extensive. __________________ Do Nothing Simply When a Way Can be Found to Make it Complex and Wonderful
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tijit Associate Join Date: Jul 2007 Location: Singapore Posts: 34	#2 Re: PLC & CNC diff 08/17/2007 11:07 PM
	What Guru says about CNC is correct. The CNC uses a language called the NC Codes, this can be programmed simply through a Notepad or converted from the ACAD software. NC codes are for three axis position control for the Servo-motor. The PLC is Programmable Logic Controller, the language is basically in ladder program, some comes with Statement. PLC is designed for process control and motor control sequence. tijit __________________ Deut 25:15,16 Honesty in dealings is to God's desires, and dishonesty is His detests.
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Anonymous Poster	#4 Re: PLC & CNC diff 08/18/2007 12:39 AM
	So far everyone is correct, more or less. CNC stands for Computer Numeric Control, PLC stands for Programmable Logic Controller Their applications are quite separate and distinct. CNC machines are used to automate the machining of raw material into components. This can range from extremely simple to extremely complex geometery. They are programmed in the NC aka G-code language. This language basically describes the steps... ie (select tool 4 (.5" mill), move to z, move to location x,y, return home, select next tool, move to next coordinates, etc etc). PLC's are primarily used in manufacturing to help automate a wide variety of tasks/controls. It is programmed using ladder logic to accomplish what ever it is you wish to do. For example... if input 3 is true (a proximity sensor detects a bottle in the station) enable output 17 (the drive motor sequence for the capper starts). Or if input 12 (the torque wrench) was not turned on, do not turn on output 38 to allow the workpiece to move to the next station. My examples are quite simple, but I hope it helps your understanding.
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All About M.E. Power-User Join Date: May 2007 Location: Florida Posts: 147 Good Answers: 5	#5 Re: PLC & CNC diff 08/18/2007 10:21 AM
	Real, Real BASIC... CNC utilizes a numerical values on a coordinate system (x, y, z for a 3-axis system) to do some kind of work, like machining, which would also utilize a speed variable PLC reads inputs and turns stuff on/off, which can be used in automation and simple mistake-proofing For a more in depth description, follow the links below to see what Wilipedia states about each... CNC PLC __________________ Light travels faster than sound. That's why some people appear bright until you hear them speak.
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