Programmable Controllers: Theory and Implementation

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Introduction to PLC Programming and Implementation—from relay logic to PLC logic8 Draw the equivalent logic gate diagram for the circuit shown in Figure 1.StartStopLS1M1M1LS2PS1Figure 1. Circuit for problem 8.9 Draw the equivalent contact symbology diagram for the logic gates shown inFigure 2.PL1SwitchStartPBLS1SOL1Figure 2. Logic gates for problem 9.10 True/False. Only real inputs and outputs are documented during address assignment.11 I/O address assignments are typically represented in one of three numbersystems: __________________, __________________, or __________________.12 The I/O address assignment table should closely follow the __________________.13 Using the circuit shown in Figure 3 and assuming that the PLC has a modularity of8 points per module, there are eight modules per rack, the master rack is numbered0, and the number system is octal:(a) circle all real inputs and outputs(b) assign the I/O addresses(c) draw the I/O connection diagramIndustrial Text & Video Company www.industrialtext.com 1-800-752-839856
Introduction to PLC Programming and Implementation—from relay logic to PLC logicL1L2PB14LS7CR1CR1PL3PS7CR1SELSOL3 UPCR2LS8LS9CR2SOL4 FWDStartResetCR2SOL5 DWNLS8CR3CR3PL4Figure 3. Circuit for problem 13.14 The principle reason for leaving certain portions of the control circuit hardwired isto:a–minimize wiringb–avoid failure of main magnetic elementsc–ensure safetyd–keep some devices running at all times15 The PLC fault contacts are wired to other hardwired emergency circuit elements:a–in parallelb–in seriesc–normally opend–normally closed16 The main reason the PLC fault contacts are included in the hardwired circuit is:a–to prevent system shut downb–to detect I/O failuresc–to include the PLC as an emergency stop conditiond–to shut down the system if there is a PLC failure17 Describe the purpose and operation of a safety control relay (SCR).18 True/False. Normally closed input devices are always programmed normally open.Industrial Text & Video Company www.industrialtext.com 1-800-752-839857
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Programmable Controllers: Theory and Implementation

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