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What can cause an Internal error 21 (inFL) on Altivar process?

INFL is the fault of Real time clock failure. The Graphic Display Terminal embeds a real time clock used for the time stamping of logged data and all other functions which require time information.
Possible cause:
1. Battery damage.
2. Start oscillator failure 
3. Communication error between graphic keypad between control board.


 
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