The TON, also known as Timer ON, an instruction is used to keep track of time of occurrence of certain events. The conditions preceding the TON instruction will allow the timer to start counting up to a specified value. Once this value is reached, the program will set specific internal bits notifying the programmer as well as other instructions within the PLC that the timer has finished counting. Furthermore, experienced developers can leverage the instruction to know when a certain process is being executed.
This is a companion discussion topic for the original entry at https://www.solisplc.com/tutorials/plc-programming-intermediate-instructions-ton-timer-on