As shown in figure "B" of the illustrated...

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Question 1 of 2066636eee28f7522a1c51f2f9

As shown in figure "B" of the illustrated block diagram of a central operating system configured for supervisory control, which statement is true concerning the block "COMPUTER" with respect to closed-loop control processes? Illustration EL-0094

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Question 1 of 20

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🔍 Key Concepts

• Role of the computer in a supervisory control system versus an advisory control system (compare figure A and figure B). • How analog controllers interact with sensors (measured variables) and actuators in a closed-loop control process. • The signal paths in figure B: which block sends set points, which block receives measured variables, and which block actually drives the actuators.

💭 Think About

• In figure B, follow the solid lines from the sensors (measured variables) to see who gets the feedback signals. Do they go directly to the computer, the analog controllers, or both? • Then follow the solid lines from the controllers toward the actuators. Which device is directly connected to the actuators and therefore must be closing the loop in real time? • Ask yourself: in a typical supervisory control arrangement, does the computer usually perform all real-time control, or does it usually adjust set points for lower-level controllers that handle the immediate closed-loop action?

✅ Before You Answer

• Verify which block(s) are directly in the loop between sensors → controller → actuators (these are the true closed-loop controllers). • Check whether the computer output (through the "Analog" and "Digital Relay" blocks) goes to the process continuously, or mainly to update set points for the analog controllers. • Confirm the role of the manual backup panel in the diagram so you don’t confuse backup/manual control paths with the normal closed-loop path.

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