Assignments on Timer and Counter
PROGRAMME EXAMPLES ON AND/OR OPERAND:-
Assignment 1:
When switch S1 is made ON an out put lamp L1 will be ON.
Assignment 2:
When switch S1 & S2 & S3 & S4 is made ON an out put lamp L1 and buzzer B1 will be ON.
Assignment 3:
When switch S1 or S2 or S3 or S4 or S5 or S6 or S7 is made ON an out put lamp L1 should be ON.
Assignment 4:
Develop a FBD program for the logic such that, it will cause an output D to go true when switch A and switch B are closed or when switch C is closed.
Assignment 5:
When a toggle switch S is made ON, it will make a bulb B1 ON & bulb B2 OFF, which is previously ON. When the same toggle switch is made OFF, bulb B1 will be OFF & B2 will remain in ON condition.Develope the logic in FBD language.
Assignment 6:
When switch (S1 & S2 & S3) OR (S1 & S2) OR (S2 & S3) will be ON, then output lamp L1 will be ON. Write a programmed in FBD language to satisfy the logic.
Assignment 7:
Convert the following lad to its equivalent FBD programme.
Assignment 8:
Develop a FBD Program that will cause output D to be on when toggle switch A is on, or either B or C is on. When both B and C
are ON and A is OFF the output D should be OFF.
Assignment 9:
Develop a FBD program for the logic such that,
In a four stair building, there is a bulb on the centre position of the corridor of the building. Any person from any stair can made that bulb ON and OFF by the use of 4 numbers of switches placed at the individual stairs of the building.
Assignment 10:
In a modern automatic office building, when both the doors are closed or both are opened, then a bulb will be ON. When any one of the door will be opened, then output will be OFF.
Developed the required logic in FBD language.
PROGRAMME EXAMPLES ON LATCHING(FBD):-
Assignment 11:
Develop a program in FBD language such that, when push button (PB1) is pressed and released a buzzer gets On and remain in ON condition till a stop push button (PB2) is pressed and released to OFF the buzzer.
Assignment 12:
Develop a program in FBD language such that, when push button (PB1) is pressed, a 3-phase induction motor and a heater are ON simultaneously and these two are remaining in ON condition even if the PB1 is released.
The heater can be stopped separately by a stop push button (PB2) but when an emergency stop push button (PB3) is pressed then both motor and heater are stopped.
PROGRAMME EXAMPLES ON MOVE AND COMPARATOR:-
Assignment 1:
When input byte 1 compares a value greater than 130 ,it will make an indicator light ON, but that input byte will be controlled by another digital input (ex: I0.0 ).Develop the required logic in FBD language.
Assignment 2:
When input signal is equal to 2050, it will make a buzzer ON. For other values than 2050, the output is OFF.
PROGRAMME EXAMPLES ON TIMER:-
Assignment 1:
Develop a ladder logic for a FLASHER (10 second duration) such that
When Switch (I0.0) is turned ON
The FLASHER should glow for first 10 second duration immediately.
The FLASHER should not glow for next 10 second duration.
The FLASHER then continues till the Switch (I0.0) is turned OFF.
Assignment 2:
In an office building at the evening when all the lights and fans of 3 rooms ( each room containing one lamp and one fan) are turned OFF, an exit door light is to remain ON for 5 minute and the parking lot light is to be remain ON for an additional 5 minute after the exit door light goes out. When the lamp and fan gets ON nothing happens to the door exit light and car parking lot light. Write the programmed in FBD language to satisfy the logic.
Assignment 3:
In an ATM counter, when main switch is ON and sensor 1 (High Temp. sensor) senses high temp. , then AC1 will be ON for 10 minute. After 10 minute AC1 will be OFF & AC2 will be ON for 10 minute & then goes OFF. Same process will be going on until sensor 2 (Low temp. sensor) senses low temp.
If in between main switch is made OFF, then both AC1 & AC2 will be OFF. Write the program in FBD language.
PROGRAMME EXAMPLES ON COUNTER:-
Assignment 1:
Assignment 2:
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