Electrical EngineeringProgrammable Logic Controller Lab →List Of Experiments

Implementation Of PLC Arithmatic Instructions

1. In any PLC based system, scan time of loop does not depend on
a) Memory capacity
b) Program length
c) CPU speed

2) The standard control signal range used for PLC analog inputs is
a) 3- 15 psi
b) 0- 20 mA
c) 4-20 mA

3) In PLC ladder program Branch instruction is used to create
a) Series of energised contacts
b) Parallel path
c) series path

4) In PLC 'OND' term stands for
a) ON Delay Timer
b) OFF Delay Timer
c) Both On or OFF Delay Timer

5) In case of PLC, ___ term is used for down counter function
a) CTU
b) CTD
c) none of these