![]() What is TON and TOF in PLC?ġ.1 Explanation of the ON Delay Timer (TON) and OFF Delay Timer (TOF) Instructions. Bit 15: Enabled (EN), this bit is on when the timer is energized. How does a TOF timer work?īit 14: Timer Timing (TT) this bit is on when the timer is timing. A program in ladder diagram notation is a circuit diagram that emulates circuits of relay logic hardware. It is one of the languages that the IEC 61131 standard specifies for use with PLCs. Ladder Diagram is a graphical programming language that you use to develop software for programmable logic controllers (PLCs). The RTO, also know as Retentive Timer, an instruction is used to keep track of time just like the TON Instruction. Then we have an RTO (Retentive Timer On Delay) which is used to keep track of run time. Next, the TOF (Timer Off Delay) Delays an event from shutting off. The TON (Timer On Delay) delays an event from turning on. Unline the TON Instruction, TOF will start counting when the preceding conditions are FALSE. ![]() The conditions preceding the TOF instruction will allow the timer to start counting up to a specified value. The TOF, also known as Timer OFF, an instruction is used to keep track of time of occurrence of certain events.
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