Timer: Timer is mainly used to keep an output ON for a specific length of time. It provides a preset delay to the control actions. In a timer, the output will be energized when the preset value becomes equal to the accumulated value. Three different types of timers include a Delay-OFF, a Delay-ON, and a Delay-ON-Retentive timer. Timer OFF Delay (TOF): TOF refers to an off-delay timer. TOF counts the time-based intervals as soon as the instruction becomes false. Here, the output changes its state from high to low when the timer provides some time delay (instruction goes from ON to OFF state). Given: In the given figure, the tags are formed for various areas of controller for various purposes. The two push buttons are used to start and stop the process. The highest level of the tank is indicated by the full level sensor switch. Here, when the tank level is full, the switch gets closed. The empty level of the tank is indicated by the empty level sensor switch. Here, when the tank starts the filling process, the switch gets closed. The “Solenoid A” is used to de-energize (it means to fill) the tank. The “Solenoid B” is used to energize (it means to empty) the tank.

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Chapter 7, Problem 13P

Program Plan Intro

Timer:

Timer is mainly used to keep an output ON for a specific length of time.

It provides a preset delay to the control actions.

In a timer, the output will be energized when the preset value becomes equal to the accumulated value.

Three different types of timers include a Delay-OFF, a Delay-ON, and a Delay-ON-Retentive timer.

Timer OFF Delay (TOF):

TOF refers to an off-delay timer.

TOF counts the time-based intervals as soon as the instruction becomes false.

Here, the output changes its state from high to low when the timer provides some time delay (instruction goes from ON to OFF state).

Given:

In the given figure, the tags are formed for various areas of controller for various purposes.

The two push buttons are used to start and stop the process.

The highest level of the tank is indicated by the full level sensor switch. Here, when the tank level is full, the switch gets closed.

The empty level of the tank is indicated by the empty level sensor switch. Here, when the tank starts the filling process, the switch gets closed.

The “Solenoid A” is used to de-energize (it means to fill) the tank.

The “Solenoid B” is used to energize (it means to empty) the tank.

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