Copyright © 2002 Delmar Thomson Learning Chapter 13 Understanding Relay Instructions and the...
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Transcript of Copyright © 2002 Delmar Thomson Learning Chapter 13 Understanding Relay Instructions and the...
Copyright © 2002 Delmar Thomson Learning
Chapter 13
Understanding Relay Instructions
and the Programmable Controller Input
Modules
Copyright © 2002 Delmar Thomson Learning
ObjectivesExplain 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
Incorrect Conversion of Conventional Start-Stop Schematic to PLC Control
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
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