PLC programmer / PLC engineer interview questions
1. What is sinking input and sourcing input/Output ?
Sinking input / output provides a grounded connection to the load
Sourcing input / output provides to the load
2.What are the different types of modules used in plc?
3.What are the different types of plc programming languages?
Ladder logic, Functional Block Diagram , Statement list
4.What is scanning period ?
5.What is the meaning of "rung" ?
6.What is the meaning of Normally Opened contact
7.What is the meaning of normally closed contact?
8.What is relay ?
9.What is marshaling cabinet?
10.What is "Floating ground"?
11.What is system ground and safety ground ?
12.What are the different types of communication protocols used in PLC?
13.What is the full form of "PLC" ?
14.What is the meaning of scaling