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.

Comments

Q1. Lamp should glow when start switch S1 is made ON. lamp should go off after 15 sec automatically. lamp should go OFF immediately when start switch S1 is made OFF. Lamp should go OFF immediately also when reset switch S2 is made ON even before the expiry of 15 sec time.

Timers in Siemens PLC Simatic manager

Timer :- Timer is nothing but a specialized clock in a programming software used to count the preset time intervals. In Siemens PLC we have various ty pes of timers as :- 1) S_PULSE(Pulse timer), 2) S_PEXT(Extended Pulse Timer), 3) S_ODT(On Delay Timer), 4) S_ODTS(Retentive On Delay Timer), 5) S_OFFDT(Off Delay Timer). You must find out another five instruction sets in Timer Block in Simatic Manager STEP 7 as :- -(SP) pulse timer coil, -(SE) extended pulse timer coil, -(SD) on delay timer coil, -(SS) retentive on delay timer coil, -(SF) off delay timer coil. 1) S_PULSE(Pulse timer) :- S_PULSE Timer Above Fig Shows how to use this timer in programming software,in this fig i have used 5 sec as a preset value, If you want to change it replace the 5 with any duration you want in S5T# 5 S. In S_PULSE timer if input to timer is ON then timer starts Counting time as well as we get the Output at the instant the input is made ON. In this timer if we mad

HOW TO DOWNLOAD AND INSTALL WONDERWARE FOR WINDOWS 8,7,10.

##You can Download a ZIP file of the software From Below link. https://drive.google.com/file/d/159y8W0c_bw0vvf1DNDQ08_QsLZ9h2Tb1/view?usp=sharing 1 ) You Can Also Watch a Video Tutorial of it below. 2) You can also read out steps from below :-

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