Babak Rooholahi - Department of Electrical Engineering, University College of Engineering, Osmania University, Hyderabad, India;
M. Nabi Roohollahi - Electrical Department, Enghelabe Eslami Technical College, Vocational University, Tehran, Iran.
Alina Galyautdinova - Kazan National Research Technical University named after A.N.Tupolev - KAI (KNRTU-KAI), Kazan, Russia.

Proportional-Integral-Derivative (PID) controllers can be found in all industries where feedback control and control loop exist. Siemens control systems which are very efficient and widely used in small, medium and big industries, play an essential role in automation technology. Understanding of the PID control algorithm, choosing an appropriate PID controller for a system, its designing and tuning always make a big challenge to implement it in industry. Programming with PID controller in Siemens PLCs is common in complicated and professional systems. A variety of PID controller designs for different kinds of systems form an outstanding advantage of Siemens control systems. In this article PID temperature control with continuous temperature controller FB58 (TCONT_CP) is studied. Implementation of the continuous temperature controller FB58 is discussed. FB58 (TCONT_CP) is one of the Siemens SIMATIC PID controllers, designed for S7300/400 PLCs to continuously control the temperature with continuous manipulated variable output or the option of influencing the manipulated value manually. The most important part of FB58 functioning is the addressing of analog Input and Output in this function block.

Continuous PID Control, FB58 (CONT_C), Feedback Control Loop, Temperature Control, Analog Signal, Programmable Logic Controller