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Why my M340 CPU real time clock is automatically updated if i enable NTP service for BMXNOC0401.2

The Ethernet communication module BMXNOC0401.2 sends its internal time setting to the PLC controller over the shared backplane. The PLC manages an internal clock to maintain this time, and uses the time setting to time-stamp system events and I/O data. By default whenever you enable NTP service for BMXNOC0401.2, it will auto update the CPU time.
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