Siemens SIWAREX FTA, Device Manual

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Weighing Functions
SIWAREX FTA
5-124
Name Type
Length
bytes Range of Values / Meaning
Reference
Timestamp1 DATE&TIME 8 Time stamp for data logging
NAWI-Status bits DWORD 4 Status bits (see 5.19.1)
AWI status bits DWORD 4 Status bits (see 5.19.2)
Unfiltered ADC value DINT 4 Unfiltered digit value from ADC
Filtered ADC value DINT 4 Filtered digit value from ADC
Net process value REAL 4 Net weight
Gross process value REAL 4 Gross weight
Filtered ADC value G/F DINT 4 Filtered digit value from ADC out of filter level 2
Net for coarse/fine REAL 4 Net weight for coarse/fine shut-off
Coarse shut-off point REAL 4
Process weight value at coarse current shut-off
point
Fine shut-off point REAL 4 Process weight value at fine current shut-off point
Temperature INT 2 Act. Temperature in the module
Status DE BYTE 1 Current status of the digital inputs
Reserve 1 BYTE[n] 13 Reserve 1
64
Table 5-34 Combination of recording elements
The evaluation of the collected data can be completed with the SIWATOOL FTA
and MS Excel or similar programs. All of the logged elements that have been
recorded are stored in the Excel table or text files and can be read in a graph over
time.
The progress of the weighing procedure can be analysed and optimised.
In the event of sporadic events in the system, the recording can be activated as
circulating memory and can be ended with a condition in the SIMATIC control
program at any time. The subsequent evaluation can help to explain a sporadic
event in the system. A simultaneous evaluation of the message buffer, in which the
last 100 events are stored (evaluation with SIWATOOL FTA) offers a good basis
for an analysis or a remote analysis.
An element requires 64 bytes. If the recording is run e.g. once per 50 msec.,
memory of 1280 bytes per second is required.
In the simplest case, the RAM of the SIWAREX FTA can be used for the logging
procedure. The measurement values can be recorded for approx. 10 minutes at
the logging speed mentioned above.
5.31 DR 123 Data content MMC
By reading the DR 122, you can define which data are to be stored on the Micro
Memory Card with the SIWATOOL FTA. Based on this information, the user can
read targeted recordings and logs.