Ch22 - 22-1 22-2 The truth state table is used to find the logic law that relates inputs with outputs EMERGENCYSTOPON••Applying Boolean Algebra

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 22-1 22-2 The truth state table is used to find the logic law that relates inputs with outputs: EMERGENCYSTOPON••Applying Boolean Algebra we can obtain an equivalent expression: )()(EMERGENCYSTOPONEMERGENCYSTOPON+•=••Finally the binary logic and ladder logic diagrams are given in Figure S22.2: Binary Logic Diagram:ONSTOPEMERGENCYLadder Logic DiagramCR2CR2StopCR1CR1StartCR3CR3THMFigure 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, BA•Since a NAND gate is equivalent to an OR gate with two negated inputs, our expression reduces to: BABA+=•Finally the binary logic diagram is given in Figure S22.3. BAYFigure S22.3. 22-4 22.4 Information Flow DiagramSTARTInlet valveopenOutlet valvecloseStopStirrer ONStopT=TsetpointInlet valveclosedOutlet valveopenStirrer OFFStopL<LLL>LHNoInlet valveclosedOutlet valveopenStirrer OFFYesYesYesNoNo22-5 Ladder Logic DiagramCR2CR2CR1CR1StartM1LHTsetpointTsetpointLLStopLHM2Sequential Function Chart22-6 Figure S22.4. 2311a1bOpen inlet valveClose exit valveLiquid Level = LHLiquid Level = LLFil the tankHeat liquidEmpty tankTemperature = Tsetpoint3a3bClose inlet valveOpen exit valve22-7 22.5 Information Flow DiagramSTARTOpen V1P1ONL=L1Close V1P1OFFL=LHeat ONTemperature>THHeat OFFOpen V2P2ONL=LClose V2P2OFFNoNoNoNo22-8 Ladder Logic Diagram:R1= Pump 1 R2= Valve 2 R3= Heater R4= Pump 2 CR1CR1StartL1CR2CR3LCR3THCR2CR4CR4LTHSequential Function Chart:Fill141TempFullB1Initial StepV1V1HeatFill2QV11L1L0THFigure S22.5. 22-9 22.6 Information Flow Diagram:STARTL<L1Open V1Open V2L<L3L<L2L<L4Close V1Open W1Close V2Open W2L<L1L<L3Close W1Close W2NoNoNoNoNoNo22-10 Sequential Function Chart:InitEmpty1Empty2BTank 1Tank 2Fill2Fill2QV1L2L4InitClose V1Open W1Close V2Open W2L1L3Ladder Logic Diagram:Figure S22.6.CR1CR1StartL1L3CR1CR3CR2CR2CR2CR4L2CR3CR3CR3CR5L4CR4CR4CR4CR6L1CR5L3CR6Valve 1Valve 2W1W422-11 22.7 Information Diagram:STARTLS2Start MLS1Stop MP=PsOpen V2LS3LS1Open V3Close V2Close V2Open V4LS2Stop MClose V3NoYesNoNoNoNo22-12 Ladder Logic Diagram:R1= V1 R2= M R3= V4 R4= V2 R5= V3 CR1CR1CR3StartLS2CR2CR2LS1LS2CR3CR3LS2LS3LS2PsCR3CR5CR4LS2PsCR3CR5LS1CR5Sequential Function Chart:Figure S22.7.Open V1InitLS2MixStart MpH1Open V2P = PSStopStop MP = PSClose V2L = LS3FullClose V2ReduceLevelOpen V4LS2DrainOpen V3LS1Close V322-13 22.8 In batch processing, a sequence of one or more steps is performed in a defined order, yielding a finished product of a specific quantity. Equipment must be properly configured in unit operations in order to be operated and maintained in a reasonable manner. The discrete stepsnecessary to carry out this operation could be: .- Open exit valve in tank car....
View Full Document

This homework help was uploaded on 04/10/2008 for the course CHE 242 taught by Professor Cummings during the Spring '08 term at Vanderbilt.

Page1 / 30

Ch22 - 22-1 22-2 The truth state table is used to find the logic law that relates inputs with outputs EMERGENCYSTOPON••Applying Boolean Algebra

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online