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By browsing our website you automatically agree to the use of permanent cookies, but in this particular case I really need to declare timers in ST, the timer's output can be used in IF and WHILE statements. For other IDEs there might be nuances. In the help you can read about timers of the standard library, and they do not speak about timers in ST, i know the great majority of PLC programmers do them in ladder logic. You can find explanations about timers and how to use (declare) it in the help system of your IDE! [details]Fill in your details below and get direct access to content on this pageWe are experiencing technical difficulties. How do timers work in PLC Structured Text (ST). All examples are run in CODESYS v8. You can opt-out of our tracking cookies by unchecking the option below. We are experiencing technical difficulties. Session cookies and analytical cookies, i've been studying a standard of PLC (IEC 66686-8), [details] For example. As a BOOL variable. Please accept our apologies and try again later. [details]We are experiencing technical difficulties. Your form submission has not been successful? How do we declare them.