9_ladder logic functions ppsx
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Higher Engineering Education Alliance Program
Ladder Logic Functions
Higher Engineering Education Alliance Program
Ladder Logic Functions
Prepared by: Ngo Van Thuyen
Topics and Objectives
Topics:
• Functions for data handling, mathematics, conversions, array
operations, statistics, comparison and Boolean operations.
• Design examples
Objectives:
To understand basic functions that allow calculations and comparisons
Basic PLC Functions
Combinatorial Logic: relay contacts and coils
Events: timer and counter instructions
Data Handling: moves, mathematics
conversions
Numerical Logic: Boolean operations
comparisons
Lists: shift registers/stacks, sequencers
Basic PLC Functions
Program Control: branching/looping
immediate inputs/outputs, fault/interrupt detection
Input and Output: PID, communications, high speed counters, ASCII
string functions
MOV Instruction
Mathematical Functions
Identifying states: an example
Mathematical Functions
Advanced Mathematical Functions
Conversions
Conversion Example
Logical Functions - Comparisons
Comparison - Example
Comparison - Example
Complex conversion
Boolean Instructions
Boolean Instructions
Design case 1: For-next
Design case 2: Flashing lights
Summary
