Programmable Controllers: Theory and Implementation

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Introduction to PLC Programming and Implementation—from relay logic to PLC logic19 What is the purpose of the normally closed PLC fault contacts in the circuit inFigure 4 and describe what will happen if the PLC fails?CoolantPump MotorHydraulicPump MotorSpindleMotorM3M2M1OLsOLsOLsDisconnectSwichFuses1M2M3ML1L2F1StopStartPLC FaultContact 1M2OLsM2 M3M3OLsSCRPL1PLC FaultContact 2PLC Fail AlarmPLCSCRFigure 4. Circuit for problem 19.20 Using the circuit shown in Figure 5 and starting inputs at address 10 8 , outputs ataddress 50 8 , and internals at address 100 8 :(a) assign the I/O addresses(b) draw the equivalent PLC ladder diagram21 True/False. In a PLC ladder program, an END MCR instruction must be used tofence the area controlled by a master control relay.22 What element can be used to trap timers in a PLC control program?a–a reset instructionb–a start push buttonc–a pilot lightd–an internal outputIndustrial Text & Video Company www.industrialtext.com 1-800-752-839858
Introduction to PLC Programming and Implementation—from relay logic to PLC logicLS14SS3PS1CR10CR10CR10SS4SOL7S4LS15Figure 5. Circuit for problem 20.23 Explain why the hardwired circuit in Figure 6 must be reconfigured when it istranslated into a PLC ladder diagram.1L1LS1CR1L2SOL1SEL1SOL223PB1CR14PB2PB3M1Figure 6. Circuit for problem 23.24 Program _____________________ is the process of translating logic or relay contactdiagrams into PLC ladder form.25 Assuming that inputs use addresses 000–027, outputs use addresses 030–047,internals start at address 100 8, timers start at address 200 8, and an internal outputis used to trap the instantaneous timer contacts, use the circuit shown in Figure 7to:(a) assign the internal addresses(b) assign the I/O addresses(c) draw the I/O connection diagramIndustrial Text & Video Company www.industrialtext.com 1-800-752-839859
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Programmable Controllers: Workbook/
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