In this tutorial, I will not only show you how those standard timer functions work but also stimulate them in the open-source CodeSys environment. Since this is the standard for PLC programming languages most platforms have these three types of timer functions available You will find them defined in the official standard for PLC programming languages – IEC61131-3 by PLCOpen. The reason for this is that they work the same way no matter which platform you are using. They can even be used to check how long an actuator has been running and then for alarms in a SCADA system.īecause this can be very confusing with all these different timer function, I will give you an introduction to the 3 standard timer functions. Timers can be used not only in ladder logic but also as functions blocks in function block diagram or functions in structured text.
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