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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 we want to ON a output for a Input ON duration and a preset duration after a input is OFF.
  • TT of TOFF :- This bit is used when we want to On a Output for preset time duration after input gets OFF.
  • TT of TON :- This bit is used when we want to turn ON a Output for a preset time duration if Input time duration is more or equal to preset time duration.
  • DN of TON and TOFF last bit of special timer:- This bit is used when you wants to turn ON a Output after preset time duration if input time duration is more than preset value and turn OFF a Output after preset value, when input gets OFF.

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