ABSTRACT
From the last century to 90 in the mid 80's, PLC has been rapid development in this
period, PLC capability in dealing with analog and digital computing power, man-machine
interface capabilities and network capabilities are greatly improved, PLC gradually entering
the field of process control, replaced in some applications in the field of process control
dominant DCS.PLC has the versatility, ease of use, wide adaptation, high reliability and
strong anti-interference, simple to program and so on.PLC control, especially in the industrial
automation sequence control the position, in the foreseeable future, is no substitute.
This paper introduces the boiler as the charged object to the boiler water temperature of
the main accused of the export parameters to furnace temperature as deputy accused of
parameters to control the heating resistance wire voltage parameters to PLC, controller,
constitutes a series of boiler temperaturelevel control system; using PID algorithm, the use of
PLC ladder programming language, programming, boiler temperature control.
Electric boilers a wide range of applications, in a considerable number of field, the
electric boiler performance advantages and disadvantages of the decision The quality of the
product.Electric boiler control systems currently used mostly for computer control
microprocessor core technology, both to improve the automation equipment have improved
the control precision equipment.
This paper on the heating boiler control system works, selection of temperature
transmitter, PLC configurations, the configuration software design aspects were
described.Through the transformation of electric boiler control system has fast response, good
stability, high reliability, control accuracy and good features, practical significance for
industrial control.
Key words: temperature control system SIMATIC S7-200 Programmable Logic
Controller classic PID control
