Logic Program
In the following example logic program, there is a normally closed contact set to "Timer variable.Q" and a timer instruction set to 1 second (1000 ms).
For more information on instructions, refer to the following.
31.7 Timer Instructions
Function Summary
The basic operation of the timer instruction (TON) is to repeatedly turn on "Timer variable.Q" after the defined time has elapsed.
After 1 second (1000ms), the TON command "Clock1SecondPulse.Q" turns on.
Upon the next scan, the TON command will be reset after the normally closed contact turns on.
When TON command is reset, the normally closed contact will be turned off and the TON command will return to a conducting state.
As a result, the normally closed contact "Clock1SecondPulse.Q" repeatedly turns OFF for one second and turns ON upon the next scan.Chapter 31 Logic Instruction List