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.

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 :-

blog2code

Search This Blog