Endress+Hauser Fieldgate FXA520, Operating Instructions Manual

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8 Advanced Functions Fieldgate FXA520
86 Hauser
8.2 Historical data
When a 256KB DAT module is being used, Fieldgate has a data logging function for buffering
measured values and events. A prerequisite for its use is that the time and date are available to the
Fieldgate, either through the use of a time server or manual entry, see Chapter 5.4.
The measured values of the connected sensors or the internal Fieldgate interfaces are saved in the
form of data records in XML format. The logged data can be called up with by adding
/history.xml
to the IP address or sent as an e-mail.
User ID
By adding a user ID (ID=1 to ID=9) to the query, e.g.
/history.xml?ID=2,
an individual view of
the historical data can be obtained. Fieldgate maintains pointers for each User ID indicating the time
when the last query was made. Only data records from this time onwards are presented.
Number of records
The number of historical records held by Fieldgate is dependent upon the number of devices
connected to it. Table 8-1 gives an overview:
Table 8-1: Maximum number of records per device as a function on number of devices connected
0 = 4-20 mA devices only
8.2.1 Calling up the historical data
1 Open the historical data for the Fieldgate by typing in the following access address (URL):
http://<IP address or Domain Name>/history.xml
Example: http://www.fieldgate.de/history.xml or http://212.227.127.81/history.xml
2 The web page opens
Devices Records Devices Records Devices Records Devices Records Devices Records
0 141 7 51 14 33 21 23 28 18
1 112 8 47 15 31 22 22 29 17
2 94 9 43 16 29 23 21 30 17
3 80 10 40 17 28 24 20
4 70 11 37 18 26 25 20
5 62 12 35 19 25 26 19
6 56 13 34 20 24 27 18