Electrical EngineeringProgrammable Logic Controller Lab →List Of Experiments

Study hardware and software used in PLC

1. The PLCs were originally designed to replace
a) Hardwired relays
b) Analog controllers
c) Microcomputers

2) What type of input a limit switch is w.r.t PLC
a) Composite
b) Analog
c) Digital

3) In a ladder diagram an output would be represented by
a) A coil symbol
b) A closed contact symbol
c) An open contact symbol

4) When referring to the capacity, the abbreviation K represents ---- locations or words
a) 1000
b) 1024
c) 1036

5) The basic difference between a PLC and a relay logic is that
a) Different types of input/outputs devices are used
b) Different voltage levels for inputs/outputs are use
c) One can be programmed other not