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product manual DVS74
Measures against missfunction caused of unintended load of the MCU (dynamic behaviour)
System has a timer monitor for each function block. Firmware will monitor each function block. There
is timeout definition for each function block. If there is no normal operation for any part more than
timeout duration, this part will be reset by system.
12.4 Fatal error
In case of a serious error, the meter displays in the first line the OBIS code 'F.F' with the value
'FFFFFF'.
The value is displayed for 2 seconds between each value in the AUTO display list.
A meter with a serious error must not be used for billing.
Meter will show fatal error 'F.F' on LCD display on follow situation:
1. The storage device EEPROM can not be access correctly for more than 100 times within 24 hours
when meter is power on.
2. The flash of MCU which saved the firmware can not be checked correctly for more than 100 times
within 24 hours when meter is power on.
3. The measurement chip for any phase can not communicate correctly continuely for more than
10800 times within 24 hours when meter is power on.
4. The Watch dog is reset more than 99 times within 24 hours of powering on the meter.
Copyright DZG Metering GmbH, Heidelberger Str. 32, D-16515 Oranienburg
22.02.2019
Kopien nur mit Erlaubnis der DZG
Page 33 / 38
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