Use of Retentive timers in mitsubishi PLC

Retentive timers are used to retain and count only ON time of Input, and once the total ON time of input goes beyond pre-set value of Timer, Timers Done bit goes ON.

Retentive timer stops counting time when input gets OFF but it retains the previous counted time duration of input.

Suppose you have a Input which gets ON and OFF very frequently and you want to turn ON a Output if the total ON time duration of Input is 10 Sec, so in that case you can use the retentive Timer.

retentive timer.

Above fig. shows retentive timer instruction and its timing diagram in Mitsubishi PLC.

Here the Tiemr T250 is a retentive timer who's time base is 100 m sec so to set the preset value of timer for 10 sec we have entered 100 as a preset value. for more details of conversion please refer the table in my Timer instruction post.

From the above fig. its clear that when we press the input of address X000, then retentive timer starts counting ON time.

When we release the input X000, then it stops counting input time, but it retains previous counted time duration.

And when the total ON duration of input exceeds the preset value then Done bit of timer gets ON.

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