Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies General settings 03.10.2011
5.1.3 Troubleshooting
If the clock on the bus is missing and if the local clock is parameterized as the time-
of-day slave, operation continues with the internal clock and a fault status message
"System time failure" is generated.
The clock has a reserve of typically 48 hours for power failure and at least 12
hours. The time of day must be reset if the power outage is longer.
If the controller loses its time of day after power failure and the time is not
retransmitted via the bus, a fault message "Invalid time of day" appears.
An invalid time of day flashes.
No. Text Effect
5001 System time failure Non-urgent message; must not be
acknowledged
5002 > 1 clock time master Non-urgent message; must be acknowledged
5003 Invalid time of day Non-urgent message; must not be
acknowledged
Fault status messages