Data Blocks - Siemens SIMATIC S7-300 Manual

Defining Parameters of the FM 354
5.3 Parameter data
What can I You can parameterize the following data storage areas:
parameterize?
This data is stored in data blocks (DBs) within the numerical range 1001 to
1239 (not including user data).
The MD, SM, TO and NC data blocks are transferred to the FM 354 and re-
side in memory there.
Parameterization of SM, TO and NC may be omitted if the associated func-
tions are not used.
The user data block must be stored in the CPU. Only then can it be filled
with data online (see Chapter 6).
Parameterization data (except for user data) can also be created, edited and
saved offline on the PU.
Data blocks (DB) Table 5-1 gives you an overview of the data blocks in the FM 354 and their
of the FM 354 meaning.
Table 5-1
DB-MD
5-6
Machine data (MD)
Increment sizes (SM)
Tool offset data (TO)
Traversing programs (NC)
User data (user data blocks)

Data blocks

Data block
Machine data (DB No. = 1200)
Block size (rounded in bytes) = 250
Machine data serves to adapt the FM 354 to the user's own specific
application. Parameterization with machine data is essential in
order for the FM's functions to be activated. The parameterized
DB-MD should be loaded to the FM. As it is written to the FM
354, the DB-MD is checked for the input limits of the individual
values and their interdependencies. It is then stored only if all val-
ues are allowed. Otherwise data error messages are displayed by
way of the MPI. A defective DB will not be retained when the
power is turned off.
The machine data can then be activated by way of "Activate ma-
chine data" or by switching the equipment on and off.
Significance
FM 354 Servo Drive Positioning Module