What is the difference between the DN and EN outputs of a timer or counter in...

What is the difference between the DN and EN outputs of a timer or counter in a PLC? Describe how each of these outputs can be used in a program.

Expert Solution

Both EN and DN are used at the outputs of the timer

EN indicates the status of the timer. When EN is ON, it indicates the timer is ON, EN off indicates that the timer is OFF

DN(done) bit is on when the timer completes its time

let us take an example of TON(Timer On Delay) which counts up to 5 seconds

Here Timer indicates the address, time base indicates the units of time or the minimum time, preset indicates the time duration and accumulator starts counting when the timer is on

Here the timer is like a relay with a coil that is energized when the input In 1 occurs. It then closes, after some present time after the input In 1 occurs.so as called rung

Working

when the timer starts, EN is in ON state for this I need to press the input 5 seconds, with a single press it can be done this thing by latching input with B3:0. It starts counting when the Accumulator value is equal to preset, the timer is off and DN is ON

This type of timer is used in applications like conveyor belts, rotating motors etc

Manojponduru answered 2 years ago

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