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# ch22 - 12345678998 22.1 Microwave Operating States...

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22-1 ±²³´µ¶·¸¹¹¸ 22.1 Microwave Operating States Condition Fan Light Timer Rotating Base Microwave Generator Door Switch Open the door Place the food inside OFF ON OFF OFF OFF ON Close the door OFF OFF OFF OFF OFF OFF Set the time OFF OFF OFF OFF OFF OFF Heat up food ON ON ON ON ON OFF Cooking complete OFF OFF OFF OFF OFF OFF Safety Issues: o Door switch is always OFF before the microwave generator is turned ON. o Fan always ON when microwave generator is ON. 22.2 Input Variables: ON STOP EMERGENCY Output Variables: START (1) STOP (0) Truth Table Solution Manual for Process Dynamics and Control, 2 nd edition, Copyright © 2004 by Dale E. Seborg, Thomas F. Edgar and Duncan A. Mellichamp ON STOP EMERGENCY START/STOP 1 1 1 0 0 1 1 0 1 0 1 0 0 0 1 0 1 1 0 0 0 1 0 0 1 0 0 1 0 0 0 0

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22-2 The truth state table is used to find the logic law that relates inputs with outputs: EMERGENCY STOP ON Applying Boolean Algebra we can obtain an equivalent expression: ) ( ) ( EMERGENCY STOP ON EMERGENCY STOP ON + = Finally the binary logic and ladder logic diagrams are given in Figure S22.2: Binary Logic Diagram: ON STOP EMERGENCY Ladder Logic Diagram C R2 C R2 Stop C R1 C R1 Start C R3 C R3 TH M Figure S22.2.
22-3 22.3 A B Y 0 0 1 1 0 1 0 1 0 1 1 1 From the truth table it is possible to find the logic operation that gives the desired result, B A Since a NAND gate is equivalent to an OR gate with two negated inputs, our expression reduces to: B A B A = Finally the binary logic diagram is given in Figure S22.3. B A Y Figure S22.3.

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22-4 22.4 Information Flow Diagram START Inlet valve open Outlet valve close Stop Stirrer ON Stop T=T setpoint Inlet valve closed Outlet valve open Stirrer OFF Stop L<LL L>LH No Inlet valve closed Outlet valve open Stirrer OFF Yes Yes Yes No No
22-5 Ladder Logic Diagram C R2 C R2 C R1 C R1 Start M 1 LH T setpoint T setpoint LL Stop LH M 2 Sequential Function Chart

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22-6 Figure S22.4. 2 3 1 1a 1b Open inlet valve Close exit valve Liquid Level = LH Liquid Level = LL Fill the tank Heat liquid Empty tank Temperature = T setpoint 3a 3b Close inlet valve Open exit valve
22-7 22.5 Information Flow Diagram START Open V 1 P 1 ON L=L 1 Close V 1 P 1 OFF L=L 0 Heat ON Temperature>T H Heat OFF Open V 2 P 2 ON L=L 0 Close V 2 P 2 OFF No No No No

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22-8 Ladder Logic Diagram: R1= Pump 1 R2= Valve 2 R3= Heater R4= Pump 2 C R1 C R1 Start L 1 C R2 C R3 L 0 C R3 T H C R2 C R4 C R4 L 0 T H Sequential Function Chart: Fill 1 4 1 Temp Full B 1 Initial Step V1 V1 Heat Fill 2 Q V1 1 L1 L0 T H Figure S22.5.
22-9 22.6 Information Flow Diagram: START L<L 1 Open V 1 Open V 2 L<L 3 L<L 2 L<L 4 Close V 1 Open W 1 Close V 2 Open W 2 L<L 1 L<L 3 Close W 1 Close W 2 No No No No No No

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22-10 Sequential Function Chart: Init Empty 1 Empty 2 B Tank 1 Tank 2 Fill 2 Fill 2 Q V1 L2 L4 Init Close V1 Open W1 Close V2 Open W2 L1 L3 Ladder Logic Diagram: Figure S22.6.
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