a control system is an interconnection of components forming a system configuration that will provide a desired system response.
primary reasons: power amplification,remote control,convenience of input form,compensation for disturbances.
important outcomes:1. increased productivity and lower product cost 2.better and more uniform quality of product 3.greater safety for operating personnel.
classifications:
open loop system: output has no control on control action.
closed loop system: maintains a prescribed relationship between the output & some reference input by comparing them and using the difference as a means of control.
servomechanism: a feedback control system to control motion.
process control system: a process control system where one or more process variables such as temperature,flow,fluid leveletc are controlled.
batch process: is a sequence of timed operations executed on the product being manufactured.
continuous process:one or more operations are being performed as the product is being passed through a process.
controllers:
1.continuous controllers
2.discontinuous controllers
continuous controller: P controller,I controller,PD controller,PI controller,PID controller.
discontinuous: two-position,three-position, multiposition controller.
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