PLC
A PLC (Programmable Logic Controller) is like a specialized computer that controls machinery and equipment in factories and industrial settings. Think of it as the 'brain' that runs automated systems in manufacturing plants, assembly lines, and processing facilities. PLCs are used because they are very reliable, can handle harsh industrial conditions, and can be programmed to control everything from simple conveyor belts to complex manufacturing processes. Similar technologies include DCS (Distributed Control Systems) and Industrial PCs, but PLCs remain the most common choice for factory automation. When you see PLC in a resume, it means the person has experience with industrial automation and machine control.
Examples in Resumes
Programmed PLC systems to automate manufacturing processes
Maintained and troubleshot PLC controlled assembly lines
Led team in upgrading factory equipment with new PLC systems
Designed and implemented Programmable Logic Controller solutions for production facilities
Typical job title: "PLC Programmers"
Also try searching for:
Where to Find PLC Programmers
Online Communities
Professional Networks
Industry Events
Example Interview Questions
Senior Level Questions
Q: How would you manage a large-scale PLC system upgrade in a running factory?
Expected Answer: Should discuss planning for minimal production disruption, backup systems, testing procedures, and coordinating with different departments. Should mention risk management and having fallback plans.
Q: How do you approach troubleshooting complex PLC systems?
Expected Answer: Should explain systematic approach to problem identification, using diagnostic tools, understanding both hardware and software aspects, and importance of documentation.
Mid Level Questions
Q: What safety considerations do you take into account when programming PLCs?
Expected Answer: Should discuss emergency stops, fail-safe conditions, backup systems, and following safety standards. Should mention importance of thorough testing.
Q: How do you document your PLC programs?
Expected Answer: Should explain importance of clear comments, maintaining updated documentation, creating user manuals, 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 basic parts like input/output modules, CPU, power supply, and how they work together to control machines.
Q: How do you test a simple PLC program?
Expected Answer: Should describe basic testing procedures, simulation if available, checking input/output connections, and verifying program logic step by step.
Experience Level Indicators
Junior (0-2 years)
- Basic PLC programming
- Reading electrical drawings
- Understanding of basic automation processes
- Simple troubleshooting
Mid (2-5 years)
- Complex program development
- Hardware installation and setup
- System documentation
- Advanced troubleshooting
Senior (5+ years)
- Project management
- System architecture design
- Integration with other systems
- Team leadership and training
Red Flags to Watch For
- No hands-on experience with actual PLC hardware
- Lack of understanding of industrial safety standards
- No experience with common PLC brands (like Allen-Bradley or Siemens)
- Unable to read electrical schematics
Related Terms
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