1.What is PLC?
PLC are solid state members of the computer family using integrated circuit instead of electromechanical devices to implement control functions.
2.What are the two basic sections of PLC? CPU The Input/Output interface system
3.What are the three major components of CPU? Processor Memory system System power supply
4.Explain logic functions of “AND” and “OR” gate?
5.Explain logic functions of “NOT” gate?
6.Explain timer instructions in ladder logic programming ?
7.Explain counter instructions in ladder logic plc programming ?
8.Differentiate SCADA and PLC?
9.Common PLC programming languages ? Ladder logic Functional Block diagram Sequential Function Chart
10.How to select a PLC (Selection Criteria ) ?
Cost of Hardware and Software
Reliability Flexibility Scalability
Ease of database configuration
Graphics development
Interlocks and batch processing
Integration of high level application
11.Leading PLC brands?
- American
Allen Bradley Modicon Texas Instruments General Electric
- European
Siemens Festo Telemechanique
3.Japanese
Toshiba Omron Fanuc Mistubishi