PLC Programming
PLC Programming involves creating instructions for specialized industrial computers (called Programmable Logic Controllers or PLCs) that control manufacturing equipment, assembly lines, and industrial processes. Think of it like creating a detailed recipe that tells machines exactly what to do and when to do it. These programs help factories run smoothly, control robotic equipment, and manage everything from simple conveyor belts to complex manufacturing systems. It's similar to regular computer programming, but specifically designed for controlling industrial equipment and processes.
Examples in Resumes
Developed PLC Programs for automotive assembly line, improving efficiency by 25%
Maintained and updated PLC Programming for food packaging equipment
Created PLC control systems for water treatment facility automation
Typical job title: "PLC Programmers"
Also try searching for:
Where to Find PLC Programmers
Professional Organizations
Online Communities
Job Resources
Example Interview Questions
Senior Level Questions
Q: How would you approach troubleshooting a complex automated production line that has suddenly stopped?
Expected Answer: A senior programmer should explain a systematic approach: checking error logs, using diagnostic tools, understanding the sequence of operations, and having a methodical process to identify and solve issues while minimizing production downtime.
Q: How do you ensure safety in PLC programs?
Expected Answer: Should discuss implementing emergency stops, safety interlocks, alarm systems, and following industry safety standards. Should mention documentation and testing procedures for safety features.
Mid Level Questions
Q: Can you explain how you would program a basic conveyor system with multiple stations?
Expected Answer: Should be able to describe setting up sequential operations, using timers and counters, implementing basic error handling, and coordinating multiple pieces of equipment.
Q: How do you document your PLC programs?
Expected Answer: Should discuss creating clear comments in code, maintaining updated documentation, creating operator instructions, and keeping track of program versions and changes.
Junior Level Questions
Q: What are the basic components of a PLC system?
Expected Answer: Should be able to explain inputs (like sensors), outputs (like motors), the CPU, memory, and basic programming concepts in simple terms.
Q: What is a ladder logic diagram and how is it used?
Expected Answer: Should explain that ladder logic is a visual programming method that looks like an electrical diagram and is used to create basic control programs for PLCs.
Experience Level Indicators
Junior (0-2 years)
- Basic ladder logic programming
- Simple machine control programs
- Reading electrical diagrams
- Basic troubleshooting
Mid (2-5 years)
- Complex automation sequences
- Multiple PLC platforms
- HMI programming
- Network communication setup
Senior (5+ years)
- System architecture design
- Project management
- Advanced troubleshooting
- Team leadership and training
Red Flags to Watch For
- No hands-on experience with actual PLC hardware
- Unfamiliar with safety protocols and standards
- Limited knowledge of industrial equipment
- No experience with real-time troubleshooting
- Lack of understanding of industrial processes
