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What may be the reason the RTC (real time clock) of a HMISCU does not retain its value after a power cycle?

A second real-time clock chip in addition to the original was added to newer hardware revisions of the HMISCU controller in hardware revision “PV 02, RL 02, SV 2.0”. This hardware revision and later revisions must be used with SoMachine V3.1 with Vijeo Designer V6.1 SP3.1 or later versions (including SoMachine V4.0).
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