INTRODUCTION TO PLC

PLC BASICS Low Cost Reliability Re-programability

INPUT MODULE

OUTPUT MODULE

OUTPUT MODULE

PLC Architecture

Wiring diagram

DATA FLOW

LADDER PROGRAMMING Conditional logic:

Conditional logic

Ladder Diagrams

Ladder Diagrams

Contact types Normally open When input occurs the contact closes Normally closed When input occurs the contact opens

Normally closed

Output and latches

Output and latches

Conditional logic Example 1

Conditional logic Example 1

Conditional logic Example 2

Conditional logic Example 2

Conditional logic Example 3

Conditional logic Example 3

Self latching

Self latching

Self latching