PID 3-Element Control Loop

[Muhammad Daniyal 0]

Could anybody tell the equation of 3-element control loop program in ML1500, or equation of the loop. i am going to commission the boiler, so this is conflicting in my mind

[TConnolly 13]

The ML1500 PID equation is listed in the instruction set reference manual. You can download the instruction set reference manual from AB's website, http://www.ab.com. Click literature library on the left hand side of your screen and navigate to the MicroLogix 1500 PLC manuals. Edited 11 Jul 2008 by Alaric

[Muhammad Daniyal 0]

Could anybody send the program of 3-element PID. there is a problem on site and pid loop is not working properly. just for reference..

[JohnM 1]

Is it possible that you may be confusing 3 element Drum Level control with the fact that there are 3 parameters in PID. You need to understand the concept before evaluating if the program is correct or not. There is an explanation of it here: http://www.controlguru.com/wp/p44.html There is also document on the Siemens USA site that explains the basics of 3 element control here: http://www.sea.siemens.com/instrbu/docs/pdf/ad353-105r2.pdf I hope the information helps.