General; Internal Time Keeping; Time Format; Status Bits - Siemens SENTRON PAC5200 Device Manual

9 Time Synchronization

9.1 General

9.1 General
During operation, SENTRON PAC5100/5200 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 SENTRON PAC5100/5200 is necessary to guarantee a common time basis for
the communication with peripheral devices and time stamping of the process data.
SENTRON PAC5100/5200 supports both external and internal time synchronization. The type of time synchro-
nization is specified during the parameterization (see chapter 7.3.6.1). The external time synchronization from
an NTP server is preferred.
9.2

Internal Time Keeping

9.2.1

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, you can configure a local time correction factor and
the automatic adjustment to daylight saving time during parameterization (see chapter 7.3.6.1).
9.2.2

Status Bits

FAIL Status Bit
The FAIL status bit implemented in the SENTRON PAC5100/5200 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 14.1.
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 2010-09-26, time 13:49.35246:
Tabelle 9-1
FAIL
0
1
DST Status Bit
With "1", the DST status bit implemented in the SENTRON PAC5100/5200 signals that the local daylight saving
time is active. The operational indication "Daylight saving time" is displayed.
212
FAIL Status Bit for Time Synchronization via NTP Server
2010-09-26 13:49.35:246
2010-09-26 13?49?35?246
Output
SENTRON PAC5100/5200, 7KM5212/5412, Device Manual
E50417-H1040-C568-A1, Edition 03.2015