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Check Yourself!

A fan should run (Q1 = 1) when the main switch is actuated (S = 1), the temperature sensor (bimetal) reports overtemperature (T = 0) and the motor is running (S2 = 1). Which logical function can be applied to this task?

PLC Ladder 2

PLC Ladder 2

 
 
 
 
 
Logic NOR

NOR

Which logical function is represented in this truth table?

 
 
 
 
 

Which statement about the function of this PLC program is correct?

PLC - 2 from 3 circuit

PLC – 2 from 3 circuit

 
 
 
 
 

Which statement about the following logical function is correct?

Interlocking Outputs in PLC

Interlocking Outputs in PLC

 
 
 
 
 

The output should only switch to state “1” if only one input has a logical “1” at a time. Which logical function do you have to use here?

 
 
 
 
 

Work order  - Coke Mix dispenser with PLC

Your work order is to develop a Coke mix dospenser with a plc. You make your choice using four buttons, as shown.

Coke dispenser with PLC

Coke dispenser with PLC

  • Create a true table ​​for all 4 outputs.
  • Create a logical equation for all 4 outputs.
  • If possible, simplify these equations using switching algebra and Karnaugh maps.

Note: Only one button should be pressed at a time. If more than one button is pressed, this means incorrect operation.