Timer functions are most important in PLC Programming. Logics play the important role in PLC Programming.
According to PLC programmer’s skills, logic will get different in application. In this program, we are going to interchange the function of On Delay Timer and Off Delay timer. AB RSLogix 500 is used to implement the concepts.
In Layman Statement, Delaying the turning “ON” of the output is On Delay Timer.
See the image below; if you turn on Input, after 5 sec output will get turn on. It will not turn on immediately.
They are
In Layman Statement, Delaying the turning “OFF” of the output is Off Delay Timer.
See the image below; if you turn on Input, output will turn ON immediately, when you turn OFF the input, It will take 5 sec to turn OFF the output. It will not turn OFF immediately.
They are
Latching is done using output coil to stay ON even Input is turned off. Normally closed timer done bit is used to turn off the output once timer accumulator value reach preset and that make TON to act as TOFF.
since the Start Input is used as normally closed input, Output Coil is attached as interlocking, so that it won’t turn on timer at the beginning of the program.
Input 2 turned to turn on timer, Memory coil is used to trigger the timer to start count and to make TOFF to act as TON.
The above used timer concept is used to under the function of timer working. It may or may not used in real time application.
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There are two lamp on pressing the start push button the first lamp should go on when the start push button is press again the first lamp should go off and the second lamp should go on if any of the lamp is on for more than 15 second they both the lamp will interchange their status ? Please solve this problem ?
How will we be interchange their status?