Difference B/W PLC & CNC

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kmrknp Active Contributor Join Date: Jul 2010 Posts: 11	Difference B/W PLC & CNC 07/12/2010 6:58 AM
	What is main differences between PLC & CNC's ?
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ozzb Guru Join Date: Mar 2007 Location: Rosedale, Maryland USA Posts: 5197 Good Answers: 266	#1 Re: Difference B/W PLC & CNC 07/12/2010 7:16 AM
	PLC refers to automated machinery in it's use of Programmable Logic Controls. CNC refers to automated machine tools and it's Numeric Control. I most cases a PLC is used in a CNC to obtain that numeric control. CNC term is usually only used in those machines used to machine parts. __________________ Life is not a journey to the grave with the intention of arriving in a pretty, pristine body but rather to come sliding in sideways, all used up and exclaiming, "Wow, what a ride!"
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#2 Re: Difference B/W PLC & CNC 07/12/2010 8:57 AM
	Just add one point that wasn't covered. The first word of CNC is computerized. As ozzb indicated, there may be other ways to "control" a numerically controlled machine than using a PC now.
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JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#3 Re: Difference B/W PLC & CNC 07/12/2010 11:56 AM
	Another issue however is the sophistication of the control capability. CNC systems imply full machining capability, including the "gold standard" of coordinated motion control, "interpolated motion"; the coordination and simultaneous execution of complex curve machining using 3 or more axis of motion. Most PLCs are not capable of that without adding motion control modules to them. On the other hand, a CNC system is probably incapable of any kind of process control such as PID loops, which is something a PLC can do. So in essence you can place a PLC into many different control platforms, including being part of a CNC system, but a CNC system is dedicated to a specific task even though that task may be inherently something that a PLC needs help with. __________________ All I every really wanted to be, was... A LUMBERJACK!.
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Le_Noble Power-User Join Date: Feb 2008 Location: Beirut Lebanon Posts: 197 Good Answers: 8	#4 In reply to #3 Re: Difference B/W PLC & CNC 07/13/2010 6:48 AM
	GA !! CNC use a much complicated algorithm for calculation, while PLC are simpler, they are more LOGIC than Arithmetic __________________ dont say it, write it
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JRaef (1); Le_Noble (1); lyn (1); ozzb (1)

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