NDLI: Towards „plug&control“: Selftuning temperature controller for PLC

Content Provider	IEEE Xplore Digital Library
Author	Pfeiffer, B.-M.
Copyright Year	1999
Description	Author affiliation: Adv. Group Technol. A&D GT5, Siemens AG, Karlsruhe, Germany (Pfeiffer, B.-M.)
Abstract	Software PID controllers have become a standard component of automation with PLCs (Programmable Logic Controllers) and work together with classical sequential function charts in the same processing units. However, traditional methods for the computer-aided design of control systems often involve high mathematical effort and are usually implemented on additional PCs that are only connected for commissioning purposes. Therefore a new, very simple concept for self-tuning PID controllers will be presented, which is implemented together with the controller on the PLC and which enables automatic tuning without prior knowledge of the process. The concept is designed specifically for temperature control, but can also be used for other control loops in the process industry which show stable time-lag dynamics and allow sufficient setpoint steps. For users, the most important advantage is the drastic reduction of commissioning time and effort. If, for example, there are ten temperature loops in one machine, the successive tuning of all ten controllers used to require several days. With the new concept, there is no longer any need for dedicated tuning. The self-tuning of all control loops is performed automatically and simultaneously on machine startup. Control performance is better than it is with the traditionally-designed PID controllers, particularly for slow temperature processes. The concept is based on a systematic startup sequence to explore process dynamics, a modified inflection point method for process identification and a separation of setpoint and disturbance control.
Starting Page	2436
Ending Page	2441
File Size	1026086
Page Count	6
File Format	PDF
ISBN	9783952417355
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-08-31
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	EUCA
Subject Keyword	Temperature measurement Programmable logic controller (PLC) Heating Process control Steady-state Temperature control PD control Adaptive control Heat transfer Software PID control
Content Type	Text
Resource Type	Article

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