PID control? - PLCS.net

Wattage · March 10th, 2004, 07:10 PM

Is there any way to program a PLC to perform PID type logic without purchasing a module with it built in?

Mark Buskell · March 10th, 2004, 07:25 PM

Buy a plc with build in PID loops like Allen-Bradley.

Sleepy Wombat · March 10th, 2004, 07:33 PM

Omrons CPM2A, CQM1H, C200H, CS1, CJ1 all support PID in their instruction set.

In fact the CJ1 and CS1-H even support PID with auto tune....

Another alternative is to program your own..Look into Sliding Mode Control (Search this forum for more details)

ordep42g · March 10th, 2004, 07:44 PM

maybe a FP0 from Matsu****a it have a PID and auto-tune built-in

Tom Jenkins · March 11th, 2004, 11:01 AM

Yes.

1) Most newer PLCs have some PID loops built in to the CPU, and not into an extra I/O or specialty card. A-B and AutomatinDirect.com and GE and most others now do it this way. Most limit you to one or four or some other specific number of PID loops.

2) PID is just a mathematical equation, widely published, and essentially using only four function math. If you understand the algorithm, you can "roll your own" PID and do the calculations in ladder or whatever.

3) Depending on your application you may not even need PID - there are lots of ways to control a process.

March 10th, 2004, 07:10 PM	#1
Wattage Member Join Date: Mar 2004 Location: Seattle, WA Posts: 1	PID control? Is there any way to program a PLC to perform PID type logic without purchasing a module with it built in?

March 10th, 2004, 07:25 PM	#2
Mark Buskell Member Join Date: Sep 2003 Location: Florida Posts: 845	PID Buy a plc with build in PID loops like Allen-Bradley. __________________ "Take whatever idiot they have at the top, give me a better idiot. Give me a caring idiot. Give me a sensitive idiot. Just don't give me the same idiot."

March 10th, 2004, 07:33 PM	#3
Sleepy Wombat Member Join Date: Oct 2003 Posts: 139	Omrons CPM2A, CQM1H, C200H, CS1, CJ1 all support PID in their instruction set. In fact the CJ1 and CS1-H even support PID with auto tune.... Another alternative is to program your own..Look into Sliding Mode Control (Search this forum for more details) __________________ Download all my sample PLC code and Utilities HERE Download PLC's Power Point Presentation HERE

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March 10th, 2004, 07:44 PM	#4
ordep42g Member Join Date: Jan 2004 Location: Curitiba Posts: 4	maybe a FP0 from Matsu****a it have a PID and auto-tune built-in

March 11th, 2004, 11:01 AM	#5
Tom Jenkins Member Join Date: Apr 2002 Location: Milwaukee, WI Posts: 4,957	Yes. 1) Most newer PLCs have some PID loops built in to the CPU, and not into an extra I/O or specialty card. A-B and AutomatinDirect.com and GE and most others now do it this way. Most limit you to one or four or some other specific number of PID loops. 2) PID is just a mathematical equation, widely published, and essentially using only four function math. If you understand the algorithm, you can "roll your own" PID and do the calculations in ladder or whatever. 3) Depending on your application you may not even need PID - there are lots of ways to control a process.

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