PLC Automation Engineer Interview Questions and Answers

Understanding electrical laws and motor principles is crucial for effective PLC automation and control systems.

• Ohm's Law: States that voltage (V) equals current (I) times resistance (R), fundamental for circuit analysis.

• Kirchhoff's Laws: Include the current law (sum of currents entering a junction equals the sum leaving) and voltage law (sum of voltages around a loop equals zero).

• AC Motors: Operate on alternating current, using electromagnetic induction; examples include indu...read more

PLC automation involves using programmable logic controllers for industrial automation, enhancing efficiency and control in processes.

• PLC Definition: A Programmable Logic Controller (PLC) is an industrial digital computer used for automation of electromechanical processes.

• Automation: Automation refers to the use of control systems for operating equipment in various industries, reducing human intervention.

• Communication Protocols: Protocols like Modbus, Profibus, and Ethernet/I...read more

Sink and source refer to the direction of current flow in a PLC system.

• Sink refers to when current flows into the input module of a PLC.

• Source refers to when current flows out of the output module of a PLC.

• Sink modules are typically used for sensors and switches.

• Source modules are typically used for actuators and solenoids.