Siemens SIMATIC S7-1200 - Page 531

Extended instructions
9.9 Recipes and Data logs
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
531
Network 5
The EN input state is based upon when the DataLogCreate operation is complete.
A create operation extends over many scan cycles and must be complete before executing a
write operation. The positive edge signal on the REQ input is the event that triggers an
enabled write operation.
Network 6
Close the data log once the last record has been written. After executing the
DataLogWrite operation that writes the last record, the log file full status is signaled when
DataLogWrite STATUS output = 1.
Network 7
A positive signal edge DataLogOpen REQ input simulates the user pushing a
button on an HMI that opens a data log file. If you open a Data log file that has all records
filled with process data, then the next DataLogWrite operation will overwrite the oldest
record. You may want to preserve the old Data log and instead create a new data log, as
shown in network 7.