Programmable Logic Controllers (PLCs)

PLCs are industrial computers designed to control manufacturing processes, machinery, and automation systems in real-time.

What is a PLC?

A Programmable Logic Controller (PLC) is a ruggedized computer used for industrial automation. PLCs continuously monitor input devices and make decisions based on a custom program to control output devices.

Key Characteristics

Industrial Reliability

• Operating temperature: -20°C to +60°C
• Resistant to vibration, dust, and moisture
• Mean Time Between Failures (MTBF) of 20+ years

Real-Time Operation

• Deterministic response times
• Scan cycles typically 1-100ms
• Priority-based task execution

Applications

Manufacturing

• Assembly line control
• Quality control systems
• Material handling

Process Industries

• Chemical processing
• Water treatment
• Power generation

Next Steps

• Ladder Logic Programming - Master the most common PLC language