Siemens Simatic S7-400 Podręcznik - Strona 16

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Siemens Simatic S7-400 Podręcznik
Micro Automation Set 14
4.4

PC-based visualization of the archive data

Table 4-4
No.
1.
The WinCC flexible "HMI" station enables
a visualization and control of the data
records to be backed up in all "Backup"
stations.
2.
The use of a uniform data structure
ensures that the access to the data
records is identical for all "Backup"
stations. Switching to each "Backup"
station and accessing the archive data is
only possible via a WinCC flexible
project.
3.
The variables in the WinCC flexible
project are cyclically updated.
Process values(reading): Updating every
two seconds
Time(reading): Updating every two
seconds
Date(reading): Updating every two
minutes
Input(writing): Updating every 500
milliseconds
4.
To avoid that a multiple of variables and
input/output boxes has to be created due
to the selection of different "Backup"
stations in one WinCC flexible project,
the variables are only addressed during
runtime. This is realized by multiplexing
the variables.
V2.0
Entry ID 21062588
Function
05/18/05
Principle of Operation
Comment
"Backup" station
Active
connection
500 ms
S7-200
IO box
Variable X
S7-300
S7-400
WinAC
Multiplex variable
Index variable
WinCC flexible "HMI"
Address in
controller
VB1
DB1.DB1
DB1.DB1
DB1.DB1
Variable with value
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