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Process Control Term Definitions Summary
Figure 6   Summing Points

Instrumentation and Control 2 of 2
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Process Controls CONTROL LOOP DIAGRAMS CONTROL LOOP DIAGRAMS A loop diagram is a "roadmap" that traces process fluids through the system and designates variables that can disrupt the balance of the system. EO 1.2 DESCRIBE  the  operation  of  a  control  loop  diagram including the following components: a. Controlled system b. Controlled elements c. Feedback elements d. Reference point e. Controlled output f. Feedback signal g. Actuating signal h. Manipulated variable i. Disturbance EO 1.3 EXPLAIN how capacitance, resistance, and transportation time affect a control system’s lag time. Terminology A  block  diagram  is  a  pictorial  representation  of  the  cause  and  effect  relationship  between  the input and output of a physical system.   A block diagram provides a means to easily identify the functional relationships among the various components of a control system. The simplest form of a block diagram is the block and arrows diagram.   It consists of a single block with one input and one output (Figure 5A).   The block normally contains the name of the element (Figure 5B) or the symbol of a mathematical operation (Figure 5C) to be performed on the  input  to  obtain  the  desired  output.    Arrows  identify  the  direction  of  information  or  signal flow. Rev. 0 Page 7 IC-07







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