Abstract: This paper is based on the design of PID controller using Programmable Logic Controller (PLC) in reactor automation plant. PID controller is design by using ladder diagram in PLC micrologix 1400. A temperature control unit temperature transmitter is also used where the temperature control unit is a special I/O unit that receives inputs directly from them, to perform PID control. Desired temperature or set point (SP) is set by the user using the SCADA (supervisory control and data accusation) and programmable logic controller will try to maintain the current temperature base on the set point temperature set by the user from SCADA. Temperature control is very difficult to be by using ordinary control techniques; hence the purpose perform PID controller implemented using programmable logic controller (PLC) in order to control the time to heating, cooling & chilling up to a particular a desired temperature set point. A complete analysis using different type of PID parameters is presented in terms of system response. Performance of the controller is examined in terms of temperature settling time, temperature rise time and temperature of percent overshoot.

Keywords: Programmable Logic Controller (PLC), Proportional-integral-derivatives (PID) Controller, Human Machine Interface (HMI).