From the course: Learning PLC Ladder Logic: 1 The Basics

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Timer instruction overview

Timer instruction overview - Ladder Logic Tutorial

From the course: Learning PLC Ladder Logic: 1 The Basics

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Timer instruction overview

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- Timer instruction is a very common instruction used in Ladder Logic programming. Timers are used to delay actions, or to keep an output on or off for a specific time. This is the congregation of typical PLC timer instruction. And it has the following parts. A timer name, or a time address, timer base, preset value, and accumulated value. Let's see what each part is. A timer is name is the timer unique identifier in the PLC memory. No matter what brand of PLC, each timer will have a name or a number to identify it. Depending on the PLC type, there is a certain way to write the name. An example is one of the Allen Bradley PLC address is T40. T, and then the timer file number, and finally, the time element number. So, T40, is time file four, timer element zero. Every timer has a timer base. Times are typically programmed with several different timer bases. The timer base is also referred to as the timer accuracy. The timer base specifies at what rate the timer will increment. So…

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