PLC Programming
PLC Programming involves creating instructions for specialized computers (called Programmable Logic Controllers or PLCs) that control manufacturing equipment and industrial processes. Think of it like writing a detailed recipe that tells machines exactly what to do in a factory. These programs control everything from assembly lines and robotic arms to packaging machines and conveyor belts. It's a crucial skill in modern manufacturing because these controllers keep factories running smoothly, ensure worker safety, and maintain product quality. Companies use different brands of PLCs, with common ones being Allen-Bradley, Siemens, and Omron, but the basic principles remain similar across all of them.
Examples in Resumes
Developed PLC Program for new automotive assembly line, reducing cycle time by 15%
Maintained and updated PLC Programming for 5 production lines
Created and implemented PLC safety protocols for robotic welding cells
Troubleshot PLC Programs across multiple manufacturing systems
Typical job title: "PLC Programmers"
Also try searching for:
Where to Find PLC Programmers
Professional Organizations
Online Communities
Industry Resources
Example Interview Questions
Senior Level Questions
Q: How would you approach implementing a complete automation system for a new production line?
Expected Answer: A senior candidate should explain the process of gathering requirements, planning safety systems, coordinating with different departments, choosing appropriate hardware, and managing project timelines. They should mention experience with system integration and troubleshooting.
Q: How do you handle system failures in a critical production environment?
Expected Answer: Should discuss backup systems, preventive maintenance, quick troubleshooting strategies, and having emergency response plans. Should emphasize minimizing production downtime while maintaining safety.
Mid Level Questions
Q: Explain how you would implement basic safety interlocks in a PLC program.
Expected Answer: Should be able to explain how to create basic safety systems that prevent machines from operating in unsafe conditions, including emergency stops and operator safety zones.
Q: How do you document your PLC programs?
Expected Answer: Should discuss the importance of clear commenting, program organization, maintaining updated documentation, and creating user manuals for operators and maintenance staff.
Junior Level Questions
Q: What is a PLC and what are its basic components?
Expected Answer: Should be able to explain in simple terms that a PLC is an industrial computer that controls machines, and describe basic components like inputs, outputs, and the main program.
Q: What is a basic PLC program structure?
Expected Answer: Should understand and explain simple program organization, basic logic operations, and how to create simple machine control sequences.
Experience Level Indicators
Junior (0-2 years)
- Basic PLC programming concepts
- Simple machine control programs
- Basic troubleshooting
- Reading electrical diagrams
Mid (2-5 years)
- Multiple PLC platforms
- Complex control systems
- HMI programming
- Production line optimization
Senior (5+ years)
- Complete system integration
- Project management
- Advanced troubleshooting
- Team leadership and training
Red Flags to Watch For
- No hands-on experience with actual PLCs
- Unfamiliar with safety regulations and standards
- Limited knowledge of different PLC brands and platforms
- No experience with industrial networks or communication protocols
