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FLOWSIC600-XT · Operating Instructions · 8018846/1BHP/V2-1/2021-05 · © SICK Engineering GmbH
Maintenance
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5.2.3
Time synchronization
5.2.3.1
Time synchronization via Modbus
The FLOWSIC600-XT has a real-time clock which continues to run also in the case of a
power failure. The real-time clock has a separate battery (BR2032). The time is saved as
UNIX Timestamp (UTC) in the device and in the stored data records. The UNIX Timestamp
specifies the number of seconds since 01.01.1970 with leap year correction.
The UNIX Timestamp can be read and set directly via register #4304 “RTC_Timestamp”.
Writing to the RTC_Timestamp sets the internal clock and is documented with an entry in
the event logbook. All external synchronizations (for example with PC time) should be
performed with this RTC_Timestamp as UTC.
The device can also return the local time. 3 registers exist for this purpose: Time (#4302
“RTC_Time”), date (#4300 “RTC_Date”) and time zone (#4306 “RTC_Timezone”). A read
access always returns the current local time.
Write access to time or date crates an entry in the event logbook each time. Setting the
time zone does not cause an entry in the event logbook because only the representation of
the local time changes, but not the UTC.
A regional adaptation of the local time representation can be performed via register #4102
“LCD_DateTimeFormat”. The European 24 h format as well as the American 24 h format
and the American 12 h format are supported.
5.2.3.2
Time synchronization with the FLOWgate™ operating software
Date and time can be synchronized In the FLOWgate™ operating software with the
connected PC during commissioning or in menu “Parameter Modification” and “System/
User”.
Fig. 50
Time synchronization
5.2.3.3
Service life/capacity of RTC battery
The real-time clock (RTC) of FLOWSIC600-XT is buffered by a battery. The device checks
permanently whether the real-time clock is working and date and time have valid values. If
this is not the case, a device error occurs and results in the respective entry in the event
logbook. The error is eliminated only when a valid date is set.
In addition, the voltage of the RTC battery is permanently monitored. If the battery voltage
drops below 1.8 V, maintenance request (low battery voltage) is signaled. If the battery
voltage rises above 2.2 V, the maintenance request is reset. If the battery voltage drops
below 1.2 V, maintenance request (no battery available) is also signaled. A low voltage level
or a battery failure also results in an entry in the event logbook. Information on battery
