Timer: Timer is special type of clock used to measure some specific time intervals. Three types of timer Delay-OFF Timer Delay-OFF timer is activated when it is turned on and does not wait for the entry of input. It is used to count downwards from the programmed time. The value of timer is cleared when the enabling input is in off state. Delay-ON Timer Delay-ON timer is activated by its input. It is used to count upwards to the programmed time. The value of timer is cleared when the enabling input is in off state. Delay-ON-Retentive Timer Delay-ON-Retentive Timer is activated by the inputs and starts accumulating time. It retains the accumulated value even if the rung goes false. It can be reset only by RESET command. Thumbwheel switch: Thumbwheel switch is a switch which is used to convert numerical values displayed on disk where the numbers are converted into binary, decimal and hexadecimal values. It contains a function called lock which helps to retain the preset value from being modified. It can be operated only by a thin object like pen tip.

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Chapter 10, Problem 3P

Program Plan Intro

Timer:

Timer is special type of clock used to measure some specific time intervals.

Three types of timer

Delay-OFF Timer

Delay-OFF timer is activated when it is turned on and does not wait for the entry of input.

It is used to count downwards from the programmed time.

The value of timer is cleared when the enabling input is in off state.

Delay-ON Timer

Delay-ON timer is activated by its input.

It is used to count upwards to the programmed time.

The value of timer is cleared when the enabling input is in off state.

Delay-ON-Retentive Timer

Delay-ON-Retentive Timer is activated by the inputs and starts accumulating time.

It retains the accumulated value even if the rung goes false.

It can be reset only by RESET command.

Thumbwheel switch:

Thumbwheel switch is a switch which is used to convert numerical values displayed on disk where the numbers are converted into binary, decimal and hexadecimal values.

It contains a function called lock which helps to retain the preset value from being modified.

It can be operated only by a thin object like pen tip.

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