Skip to main content

Q2. When a push button is pressed and released the lamp should glow and gets OFF automatically after 25 sec.If before the expiring of 25 sec if a reset switch is made on the lamp goes OFF immediately.


fig Q2.

  • Above fig. Q2. shows the solution for the problem Q2.
  • Here in this problem we want to run the lamp 25 sec when the start button is pressed so we have used the ton timer with preset value of 25 sec and one NO start contact.
  • In the first rung of the program one NC reset contact is connected in series with the one start button and the output coil B3:0/0.The start button is connected in parallel with the B3:0/0 NO contact.so when the start button is pressed, B3:0/0 goes in the latching mode and when reset is pressed it unlatch the B3:0/0 coil
  • In second run of the program B3:0/0 is connected to TON timer with preset value of 25 sec.
  • In third rung of the program output is connected in series with the one NO TT bit and one NC DN bit addressed contact,If you connect only the NO TT bit  and it will works same.


Labels:

Comments

Post a Comment

Popular posts from this blog

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 :-
2 comments
Read more

Bit Logic Instruction in Simatic manager

There are total 14 instructions under the bit logic instruction like NO contact, NC contact, SR flip-flop, RS flip-flop,invert power flow etc. lets see the detailed use of them.  A) Normally open contact :- Normally open contacts are closed when the bit value stored at the specific address is equal to 1 (one)(here the specific address refers to the address assigned to the NO contact), when we press the Normally open contact assigned to the specific address then it becomes functionally closed and we get supply. here in below fig. when we press the NO contact I0.0 then Output Q0.0 gets ON and when we release the input I0.0 then Output gets OFF. B)Normally Closed Contact :- Normally closed contacts are closed when the bit value stored at the specific add, i.e. the address assigned to the NC contact is equal to 0(zero). when we press the Normally closed contact assigned to the specific address then it becomes functionally open and supply is cuts off. NC contact wor...
Post a Comment
Read more

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...
Post a Comment
Read more