What is a PLC (Programmable Logic Controller)?

What is a PLC?

A PLC (Programmable Logic Controller) is a ruggedized computer designed to control industrial processes (machines, production lines, robots). Unlike home computers, it is built to operate 24/7 in harsh factory conditions such as dust, humidity, vibration, and extreme temperatures.

What Does It Do?

The PLC reads "Input" signals from the field, makes decisions based on the program written inside it, and manages "Output" signals.

• Inputs: Sensors, buttons, switches, Digital Transmitters.
• Process: "If temperature exceeds 100°C..."
• Outputs: Stop the motor, open the valve, sound the alarm.

Sensor Integration

Modern PLCs no longer just read "on/off" signals, but also intelligent sensor data via protocols like Modbus or Profinet. Amazeng ZMA Data Acquisition Cards act as an interface (gateway) allowing PLCs to read analog signals with high precision.