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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Timer instruction

In mitsubishi PLC Gx-Developer programming software we have total 512 timers From T0 - T511. These timers are categorized into 5 groups depending upon the time base and type of timer as :- T0 - T199 timers works as Done bit of TON timer (time base-100ms). T200 - T245 timers works as Done bit of TON timer (time base-10 ms). T246 - T249 timers works as Done bit of retentive timer (time base- 1 ms). T250 - T255 timers works as Done bit of retentive timer (time base-100 ms). T256 - T511 timers works as Done bit of TON timer (time base- 1 ms). You may be aware of the working of the TON timer and RTO timer, which works similarly of TON and Retentive timers in AB PLC, the only difference is you only get the done bit of timers in mitsubishi PLC. To enter proper preset value to the timers of various time bases we need to convert the seconds into the respective time bases. Below table shows the conversion of pre-set values into the respective time bases. We can use the sa...

Special Timer

Special Timers of mitsubishi PLC comes with both functionality of TT and Done bit of TOFF and TON timers. Special timer Here STMR is the is the special timer function, To is the TON timer, K100 is the preset value(you can give K10,K200, etc depending upon of the preset you require), and M0 is the result of the timer. here i have used memory address M0 to store result of timer, and in Special timer the next three consecutive memory addresses are automatically assigned to store TT and Done bits of timers. Here M0 is used to store the Done bit of TOFF timer,M1 for the TT bit of TOFF timer, M2 for TT bit of the TON timer, and the last M3 bit is used to store both Done bits of TON ans TOFF timers(first it works as a done bit of the TON timer and then it works as a done bit of the TOFF timer). Timing diagram for special timer. Above fig. shows timing diagram of the special timer with timing diagram with preset value of 5 sec. DN bit TOFF :- This bit is used, when...

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