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Tesys T date and time setting is reset to factory default value automatically after 2 to 3 days of setting. Please suggest a solution?

Tesys T is very sensitive to the control supply loss and resets to the default date and time settings if the power supply is off for more than 20-30 minutes. 

So, if it is required for the Tesys T to transmit the correct time and date, the supply for the Tesys T should be given permanently from UPS.

Further the date and time information is stored on the registers from 655-658 in the attached format(General Date Format Tesys T.pdf). You can write the registers 655 to 658 through Modbus messaging to update the date and time through PLC.
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