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Programmable Logic Controllers

SKET 122

Programmable Logic Controllers

SKET 122

Course Description

Prerequisite: SKET 130 with a minimum grade of "C". Builds on the skills developed in SKET 130 and applies the concepts learned to Programmable Logic Controller (PLC) systems. Includes hardware topics installation procedures, wiring diagrams, system architecture, and I/O modules and software topics basic logic elements, timers, counters, program control, math functions, data manipulation, sequencers, shift registers, and file/word transfers. Includes lab activities utilizing RSLogix and RSLinx software for creating, editing, saving, downloading, and uploading programs. Applies subject material from lecture in the laboratory through the use of PLC training systems. Uses drawings to construct control circuits, analyze the process, make revisions to wiring or set-up configurations as necessary, and evaluate the proper operation of the PLC circuit. Credit may be earned in SKET 122 or ET 122 but not both. (45-30)

Outcomes and Objectives

Recognize and explain the operation of hardware in a PLC system.

Objectives:

  • Identify and describe the operation of a PLC input and a PLC output card.
  • Identify and describe the functions of a CPU in a PLC system.
  • Identify and describe the operation of a power supply in a PLC system. Determine the proper sizing of a power supply to meet the power requirements of a PLC system.
  • Configure, connect, and utilize a PC to communicate with a PLC processor.
  • Integrate hardware devices used in control circuits to a PLC system. Explain the state for various input devices required to energize a PLC input. Determine the requirements to energize a PLC output.
  • Recognize and draw the schematic symbols for devices used in PLC circuits. Differentiate between different symbols, conventions, and terminology from wiring diagrams.
  • Differentiate between fixed and modular PLC architectures.
  • Explain the procedures required to properly install a PLC system.

Recognize and explain the operation of software in a PLC system.

Objectives:

  • Differentiate between data files and program files in a PLC.
  • Describe a PLC scan including the order of operation and the scan time required to perform all tasks.
  • Identify and describe the operation of basic logic elements in a PLC program.
  • Identify and describe the operation of timers and counters in a PLC program.
  • Explain how program control elements allow the PLC to alter the normal execution of the PLC scan.
  • Describe the use and operation of math functions for performing calculations on data in PLC programs.
  • Explain how sequencers can be used to perform repetitive operations using event driven or time driven control.
  • Differentiate between various forms of data manipulation techniques including the use of move instructions, shift registers, and file/word transfers.
  • Identify and describe the use and operation of a one shot instruction.
  • Differentiate between main program files and subroutines.
  • Differentiate between bit and word instructions and data.

Demonstrate ability to configure and use programming software.

Objectives:

  • Configure and utilize RSLinx software to establish a connection between a PC and the PLC.
  • Utilize RSLogix for creating, editing, saving, downloading, and uploading programs.
  • Demonstrate the ability to make online program edits.
  • Demonstrate the ability to view and modify the contents of words in the data file.
  • Demonstrate the ability to troubleshoot PLC logic programs.
  • Differentiate between different modes of operation for the PLC processor including RUN, PROGRAM, and REMOTE modes

Relate knowledge about electrical devices to PLC systems.

Objectives:

  • Explain the use of the PLC in safety circuits.
  • Recognize and discuss the use of PLC systems in machine and process control. Differentiate between relay control and PLC control systems.
  • Recognize and explain the integration of failsafe design practices.
  • Recognize and explain the need for effective panel layouts, the use of wiring terminals, and the importance of preventative maintenance in industrial PLC systems.
  • Apply NEC and NFPA standards to PLC circuits.

Conduct laboratory experiments to reinforce lecture material.

Objectives:

  • State, comprehend, and comply with safety precautions when working on electrical equipment.
  • Construct control circuits using electrical devices and laboratory PLC equipment. Predict and analyze the proper operation of PLC circuits. Troubleshoot and make wiring modifications, if necessary, to obtain the desired results of the control schematic.
  • Evaluate the proper operation of the PLC program using programming software.
  • Design, program, and troubleshoot PLC circuits from a narrative description.
  • Develop troubleshooting techniques.