MPC Fundamentals MPC Fundamentals This section reviews MPC concepts and defines key terms. If you re already familiar with MPC you may prefer to read Chapter 2, "MPC Worksheet Basics"next Overview: single-input, single-output(SISO)MPC Figure 1-l shows a situation in which MPC is trying to hold a single variable, y, at a target value, r, by adjusting the"manipulated variable"(or"")u See Table 1-1 for a brief description of the signals appearing in Figure 1-1 The box labeled"plant"is the real process or mechanism that produces y. It responds to changes in u as well as to two types of disturbance signals: measured, v, and unmeasured, d (Some applications have unmeasured disturbances only; the v signal is optional. The unmeasured disturbance represents the usual mysterious events that upset plant operation, causing variations in y. The only sign that such an event has occured is a change in the measured output,y Measured Disturbance Noise Actuator MPC Plant Disturbance Measured Output( Controlled Variable) Figure 1-1 Block diagram of a single-input, single-output MPC application.MPC Fundamentals 1-5 MPC Fundamentals This section reviews MPC concepts and defines key terms. If you’re already familiar with MPC you may prefer to read Chapter 2, “MPC Worksheet Basics” next. Overview: single-input, single-output (SISO) MPC Figure 1-1 shows a situation in which MPC is trying to hold a single variable, , at a target value, r, by adjusting the “manipulated variable” (or “actuator”) u. See Table 1-1 for a brief description of the signals appearing in Figure 1-1. The box labeled “plant” is the real process or mechanism that produces . It responds to changes in u as well as to two types of disturbance signals: measured, v, and unmeasured, d. (Some applications have unmeasured disturbances only; the v signal is optional.) The unmeasured disturbance represents the usual mysterious events that upset plant operation, causing variations in . The only sign that such an event has occured is a change in the measured output, y. Figure 1-1 Block diagram of a single-input, single-output MPC application. y y y + + MPC Plant v r y d z y y u v Measured Disturbance Measured Output (Controlled Variable) Noise Setpoint Unmeasured Disturbance Actuator Plant Output