Copyright © 2002 Delmar Thomson Learning Chapter 13 Understanding Relay Instructions and the Programmable Controller Input Modules
Copyright © 2002 Delmar Thomson Learning Objectives Explain proper programming of normal closed and normally open PLC input signals. Describe hardware relay operation and its correlation to proper PLC interface and programming. Convert a conventional start-stop schematic to a PLC ladder rung diagram.
Copyright © 2002 Delmar Thomson Learning Objectives (cont’d.) Explain why PLC ladder logic for motor starter interface has an additional contact in comparison to a conventional schematic. Hook up a start-stop station to a PLC input module. Hook up and develop a PLC program to correctly control a motor starter.
Copyright © 2002 Delmar Thomson Learning Typical Hard-Wired Start-Stop Latching Circuit
Copyright © 2002 Delmar Thomson Learning Incorrect Conversion of Conventional Start-Stop Schematic to PLC Control
Copyright © 2002 Delmar Thomson Learning Normally Open Push Button and Non-Energized Relay
Copyright © 2002 Delmar Thomson Learning Normally Open Push Button Energizing Relay Coil and Pilot Light B
Copyright © 2002 Delmar Thomson Learning Normally Closed Push Button Energizing Relay Coil and Pilot Light B
Copyright © 2002 Delmar Thomson Learning Normally Closed Stop Push Button Depressed
Copyright © 2002 Delmar Thomson Learning Relay Status in Conjunction with Input Push Buttons
Copyright © 2002 Delmar Thomson Learning Input and Output Separation
Copyright © 2002 Delmar Thomson Learning Separated Inputs Connected to PLC Input Screw Terminals
Copyright © 2002 Delmar Thomson Learning Start Push-Button Status Reflected in the Input Status Table
Copyright © 2002 Delmar Thomson Learning Start-Stop Input Bit Status from Input Hardware in a Non-Energized State
Copyright © 2002 Delmar Thomson Learning Normally Open Push Button Not Activated
Copyright © 2002 Delmar Thomson Learning Normally Open Push Button Input Pressed
Copyright © 2002 Delmar Thomson Learning Normally Closed Input Push Button
Copyright © 2002 Delmar Thomson Learning Normally Closed Push Button Input to PLC
Copyright © 2002 Delmar Thomson Learning Push Button Released Output Latched through CR 1-1
Copyright © 2002 Delmar Thomson Learning Conventional Schematic Start-Stop Logic
Copyright © 2002 Delmar Thomson Learning Conventional Motor Starter Schematic Diagram
Copyright © 2002 Delmar Thomson Learning Conventional Motor Starter Circuit Converted for PLC System Management