PRACTICE QUESTIONS ON NO/NC LOGIC
EXAMPLE 1:-
Write the equivalent STL programme for the given ladder logic
EXAMPLE 2:-
Write a programme in STL such that when a switch is made ON, the motor gets OFF.
EXAMPLE 3:-
Write the equivalent STL programme for the given ladder logic.
EXAMPLE 4:-
Write a STL programme for the panel board door control system, when the door is open the cooling fan gets off and a lamp gets on.
EXAMPLE 5:-
Write a STL programme for two motors such that both have a common stop and start switch with individual start switches.
The condition for starting the motor is that first switch on the common start switch, then switch on the motors using individual switches. To stop the motor presses the stop switch.
EXAMPLE 6:-
Write a STL programme to run a heater of the boiler with conditions that the air valve should be closed which is operated by switch S1, the water valve should open which is operated by switch S2 and when the heater switch S3 is made on heater will be on.
EXAMPLE 7:-
Write a STL programme for a five-directional conveyor system such that when any of the sensors from the conveyors senses metal ores then the inlet valve of the blast furnace opens.
EXAMPLE 8:-
Write the STL programme of the given ladder logic.
EXAMPLE 9:-
Write the STL programme of the given ladder logic.
EXAMPLE 10:-
Write the STL programme of the given ladder logic.
TASK ON INCHING/LATCHING:-
EXAMPLE 1:-
When a push button is pressed the 3Ф motor gets on and gets off when released. (Inching Circuit).
EXAMPLE 2:-
When a start push button is pressed the 3Ф motor gets on and remains in on condition after the release of a push button. The motor can be stopped by the stop push button.
EXAMPLE 3:-
Write the STL programme of the given ladder logic.
TASK ON SPDT AND XOR/XNOR:-
EXAMPLE 1:-
Write a STL programme for two toggle switches such that when any of the switches is made on the output gets on. When both the switches are made on or off the output gets off.
EXAMPLE 2:-
Write a STL programme for two toggle switches such that when both the switches are made off/on the output gets on. If any of the switches is made on the output gets off.
TASK ON MOVE AND COMPARATOR:-
EXAMPLE 1:-
Write a programme on STL such that when input byte 0 gets a value of 10 it switches on a motor when the value of byte 0 exceeds 10 the indicator light gets on when the value of byte 0 is under 10 the green indicator remains on.
EXAMPLE 2:-
Write a programme on STL such that when input byte1 does not get the value of 64 it will make a lamp on; the lamp should remain on if the value of byte 1 is between 32 and 96.
TASK ON TIMER:-
EXAMPLE 1:-
Develop the STL programme such that an output light will turn on, 15 seconds after switch A has been turned on.
EXAMPLE 2:-
Write a programme on STL such that when we press the start push button the star contactor starts immediately and the delta contactor starts after 15 seconds. When the delta contactor gets on the star contactor gets off. To stop the process press the stops push button.
TASK ON COUNTER:-
EXAMPLE 1:-
Develop the STL programme for a light that will turn on, after switch A has been closed 10 times. Push button B will stop the light.
EXAMPLE 2:-
Develop the STL programme such that when a push button (I0.0) is first time pressed and released it makes an output (Q0.0) ON. For the second time when the same push button (I0.0) is pressed and released it makes the same output (Q0.0) OFF.
NO/NC NO/NC NO/NC NO/NC NO/NC NO/NCNO/NC NO/NC NO/NC NO/NC NO/NC NO/NCNO/NC NO/NC NO/NC
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