PLC UNIT 2

The abbreviations NO and NC represents the electrical state of switch contacts when_______________.

• Power is applied

• Power is not applied

• The switch is actuated

• The switch is not actuated

A________converts electrical pulses applied to it into discrete rotor movement

• Tachometer  

• Solenoid

• Stepper motor

• Electronic magnetic flow meter

Digital  I/O modules operate on___________

• 24V AC supply  

• 24V DC supply

• 5V  AC supply

• 12V DC supply

Discrete input modules accept signals from field devices that are________

•  Analog type

• Digital Type

• Two-state Type

• Digital or Two state type

The processor in any PLC is designed to perform specific duties in a specific sequence and then continuously repeat the sequence.The operating cycle is called __________

• Access time

• Operating system

• Scan Cycle

• scan time

The scan consists of a series of sequential operations which include, Reading________, program execution, data output

• connection 

• Input

• Output

• Tie point

If the input devices change its state while the processor is in program scan or output scan of the scan cycle then the plc will _____________

• Immediately react to them          

• React during the next scan cycle        

• Response very  slow

• Does not  react to them   

If two NC contacts are connected in series that satisfies _______Gate logic

• AND

• NAND

• OR

• NOR

NC contact can be used to satisfy ________gate condition.

• AND
• XOR
• NAND
• NOT

If two NO contacts are connected in series that satisfies _______Gate logic.

• OR
• NAND
• AND
• XOR