Siemens S7-1500 Function Manual page 51
Automation system
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- System manual (523 pages) ,
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- Manual (188 pages)
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Memory usage and application examples
3.2 Memory usage for data logging
Network 5
Close the data log after the last data record has been written. After execution of the
"DataLogWrite" instruction, which writes the last data record, the STATUS output is set to
"1".
Figure 3-9
Network 5
Network 6
A rising edge at the input REQ of the instruction "DataLogOpen" simulates that the user
presses a button on an HMI device, which opens a data log. If you open a data log in which
all records are occupied by process data, then the next execution of the "DataLogWrite"
instruction overwrites the oldest data record. You can however also preserve the old data
log, and create a new data log instead. This is shown in network 7.
Figure 3-10
Network 6
50
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC
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