Q :- Lamps A,B and C turns ON when a switch is closed. Lamp B turns OFF after 8 sec's and Lamp C turns OFF after 11 sec's after Lamp B gets OFF

Solution :-

Above figure shows the ladder diagram solution for the problem Q2.0.

At initial condition when the start button I:1/0 is not pressed all the lamps are in OFF conditions.

when the start button is pressed then the TON timer gets activated.

we have given the preset value to the timer as a 19 sec's which is nothing but a total time duration for which the lamp B is ON and Lamp C ON after lamp B.

In second rung of program as soon as the start NO contact is pressed it will activate the lamp A, and when released it will deactivate the lamp A.
In third rung of program start NO contact is connected with the less than equal to comperator and lamp B. In the comperator Timers Accu. address is given to the source A and a constant value is given to Source B, so when the timers value is grater than B comperator value goes low and the Lamp B gets OFF.
When the timer is ON for more than a 19 sec's Done bit of timer goes ON. In fourth rung done bit address is given to the NO contact whic is in series with lamp C. so the lamp C activates after 19 sec's or after 11 sec's after lamp B gets OFF.

⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓

Comments

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 :-

Block Diagram of PLC.

Hardware / Block diagram of PLC. Above fig. shows the block diagram of PLC.

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...

blog2code

Search This Blog