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|Timer / counters, such as TON, are synchronized between primary and standby. When not primary/standby they are not synchronised. Hence when sync comes back, the value might be overwritten by the Primary or not, depending on the configuration.
Moreover, when the system starts and both CPU are powered up, CPU run first some cycle in WAIT mode before being in Standby mode. If a block (such as TON) is used in WAIT and later on in standby, value have changed because the block is now sync with primary. A bump in the actual value might appear when CPU transits from WAIT to STBY
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