General; Internal Time Keeping; Time Format; Status Bits - Siemens 7XV5673 Device Manual

7 Time Synchronization

7.1 General

7.1 General
During operation, SICAM I/O Unit needs the date and time for all time-relevant processes. The term time is
used throughout this section to refer to both the date and the time.
The time synchronization in the SICAM I/O Unit is necessary to guarantee a common time basis for the com-
munication with peripheral devices and time stamping of the process data.
SICAM I/O Unit supports both external and internal time synchronization. The type of time synchronization is
specified during the parameterization (see chapter 6.3.3.5).
7.2

Internal Time Keeping

7.2.1

Time Format

The internal time is kept in UTC (Universal Time Coordinated) from 01.01.2000, 00:00 to 31.12.2099, 23:59.
To display the local time for example on the HTML pages of the user, you can configure a local time correction
factor and the automatic adjustment to daylight saving time during parameterization (see chapter 6.3.3.5).
7.2.2

Status Bits

FAIL Status Bit
The FAIL status bit implemented in the SICAM I/O Unit signals with "0" that the time is valid and with "1" that
the time is invalid.
The status of the FAIL bit corresponds to the "Clock error" operational indication, see chapter 12.
The following table lists the time stamps of events or indications for the displayed operational and error logs
according to status bit set/not set using the example of date 2007-09-26, time 13:49.35246:
Table 7-1
FAIL
0
1
NOTE
When time output contains "?", there will be no time synchronization. In this case, first of all, parameterize the
Source of the time synchronization "Internal" and afterwards the desired time synchronization source again.
DST Status Bit
With "1", the DST status bit implemented in the SICAM I/O Unit signals that the local daylight saving time is
active. The operational indication "Daylight saving time" is displayed.
130
FAIL Status Bit for Time Synchronization via NTP Server
Output
2010-09-26 13:49.35:246
2010-09-26 13?49?35?246
SICAM I/O Unit, 7XV5673, Device Manual
E50417-H1040-C484-A3, Edition 05.2012