Storing The Parameter Data In Sdb - Siemens SIMATIC FM 353 Manual

Defining Parameters
5.5 Storing the parameter data in SDB w 1 000
Overview
The FM 353 stores its parameter data internally.
In order to ensure that the parameter data are available if a fault develops on the
FM 353 and no programming device/PC is at hand, the data can be stored in a
system data block (SDB w 1 000). The CPU transfers the data stored in SDB w
1 000 to the FM 353 on each new start. If the FM 353 has no machine data or the
internal time stamp (time of creation) is invalid, the data are transferred from SDB
w 1 000 to the FM 353 and saved there.
The time stamp is renewed every time a DB (parameter data) is opened and when
a file is imported. If the contents of the DB are modified (for instance the machine
data), a new time stamp is also generated when the DB is saved or loaded.
You must ensure that the parameter data in
SDB w 1 000 always match the parameter data on the FM 353 when start-up
is complete.
Note
If parameter data are modified again in the FM following creation of SDB w 1 000,
they are overwritten when the CPU is restarted (see "Time stamp", above).
SDB w 1 000 should therefore not be created until start-up is finished!
If you need to modify the data subsequently, you should generate SDB w 1 000
again and load it into the CPU. You can delete the previous SDB before you load
the new one, however the new SDB automatically overwrites the old one when it is
generated. The old SDB and the new SDB do not have to be allocated the same
number.
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FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0