The value, 0 to 2,147,483,647, is still limited to lower than the true 32-bit maximum due to the TIME data type and how it is structured in the PLC firmware. If declaring a Timer and you realize you need a large time preset, using the TIME data type for the preset on the Timer gives you the range up to a 32-bit unsigned value. With these functions, it is strictly preference but perhaps ease of integration, if you are adding logic to an existing program or selecting a preferred style of logic in a new project. After the time, you will need to designate whether the time is in seconds (S) or milliseconds (ms). With Timers, you start with a “T#” followed by the time of preset you wish to use. They have the same inputs and the same format for entering the preset time. Examples of FBD TOF and TOF_EĪs you can see, they have similar formats when inserted into the logic. Both styles have their pros and cons, but for the timer and counter functions, they behave very similarly. We will stick with the ladder and the functional block diagram formats for this article. In Mitsubishi programs, there are a few ways you can use a timer function in your programming. You can just start typing TON of TOF or you can drag and drop the POU (function) from the element selection bar usually on the right of the editor. These functions usually have an “_E” in the name of the function definition (TON_E).Ĭontinuing with the variations of timers, you can add the function to your program in a couple of ways. There are versions (Data Types) of the timer functions that have an added EN (enable) added to the input to control when the time starts to lapse. With timers, there are commonly used Time ON timers (TON) and Time OFF timers (TOF). Class selection during Label Registration Timers The second is that you can set the global or local scope as well as if it is strictly a variable, a constant, or a retained variable class type. The first being the label creation when inserting the function into your code. There are two critical pieces to programming each timer or counter. These are similar but not necessarily set up the same as the other manufacturers. Like most programmable logic controllers on the market, Mitsubishi has its versions of both timers and counters.
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March 2023
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