Q-1) – The lamp should glow when the start switch SI is made ON. The lamp should go off after 15 seconds automatically. The lamp should go OFF immediately when starting switch S1 is made OFF. The lamp should go OFF immediately when reset switch S2 is made ON even before the expiry of 15 sec time.
Purpose of this Task - You will learn how to use a timer if we use a switch as an Input of the timer.
You will learn how to turn on any Output for a given Timer.
Solution Task 1
2) When a push button is pressed and released the lamp should glow and get off automatically after 25 seconds. If before the expiration of 25 seconds if a reset switch is made on the lamp goes off immediately.
Purpose of this Task: 1) You will learn how to use a timer if we use a Pushbutton as an Input of the timer.
You will learn how to turn on any Output for a given Timer.
Solution Task 2:
3) The lamp should glow after a delay of 15 seconds when start switch s1 is made on. The lamp should remain in glowing condition till the start switch s1 is turned on. The lamp should go immediately off when start switch s1 is made Off.
Purpose of this Task: You will learn how to turn on output after a delay.
Solution Task 3:
4) Lamp should glow after a delay of 25 seconds when the start switch SI is made ON and should remain ON in glowing condition even when the switch is made OFF. The lamp should go OFF immediately when a reset switch is S2 is made ON.
Purpose of this Task - This question will teach you sometimes we have to latch the switch.
also.
Solution Task 4:
5) The lamp should glow immediately when a start switch S1 is made ON. The lamp should remain in ON condition if S1 is ON. The lamp should go OFF after a delay of 15 seconds when the start switch SI is made OFF.
Purpose: This Question is totally based on the
Toff timer available in Allen Bradley & Siemens. But in Mitsubishi & Delta toff is not available, although you can make a ladder by
using LDP & LDF is (Positive & Falling Edge)
Solution Task 5:
6) A timer is to run a fan for 8.67 sec after a wall switch is made ON. If the wall switch is turned OFF during the 8.67 sec time interval, the time is reset to zero sec, so that when the wall switch is again turned ON, the delay is full 8.67 sec.
Purpose of this task – You will learn Time Base concept from this task.
Solution Task 6:
7) When the switch is turned ON
(i) A lamp goes ON immediately and then
(ii) A fan goes ON 9 seconds later.
When the switch is turned OFF The lamp & the fan both should go OFF.
Purpose of this Task - You will learn how to operate two Outputs with a single timer.
Solution Task 7:
8) When a switch is turned ON
(i) A Light & A Fan are turned ON.
When the switch is turned OFF The Fan goes OFF immediately but
(ii) The Lamp remains ON for another 7 seconds & then goes OFF.
Purpose of this Task - Purpose – This Question will teach you how you can use two states (ON/OFF) of Switch with the Timer. You will also get the Idea of how you can use LDP OR LDF.
Solution Task 8:
9) There are four Lamps connected in a circuit and one Switch. When the Switch is turned ON (i) Lamp 1 starts immediately.
(ii) Lamp 2 starts 4 sec later than Lamp 1 (iii) Lamp 3 starts 5 sec after Lamp 2.
Purpose of this task: This Task will teach you the cascading of the Timer Concept.
Solution Task 9:
10) – We have start or stop Pushbuttons (PB) and
One Led, when we pressed start PB, Led 1 glows for 10 Seconds. If before completing 10 seconds, you press stop Pb timer should not reset to zero, The Timer should remember the accumulated value.
Purpose of this Task: You will learn the role of the retentive timer in the PLC Program.
Solution Task 10:
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