9-38
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
Please note the following when using the function “Write parameters and
with retentive storage” (byte 4, job type 4):
Retentive writing must only occur on demand (not cyclically)!
Modal data are stored on FEPROM (maintenance-free, no battery required).
This memory has a physical limit for the possible number of delete/repro-
gram cycles: minimum 10
5
,
typically 10
6
. The possible number of delete/re-
program cycles can be multiplied, from the user’s viewpoint, by providing a
larger retentive memory capacity (much larger than the parameter data
memory) and organizing the memory accordingly.
Number of delete/re-
program cycles
=
128 000
10
6
(typical)
Block size (in bytes), in which param-
eter data are modified
Block sizes:
DB Machine data
approx. 310 bytes
DB Increments
approx. 460 bytes
DB Tool offset data
approx. 310 bytes
DB Traversing programs
110 + (20 x no. of traversing blocks) bytes
Example:
Assuming a service life of 10 years and 24-hour operation, a typical limit =
10
6
.
Parameterization
data
DB size
Number of possible de-
lete/reprogram cycles
Number of possible de-
lete/reprogram cycles
per minute
MD
310 bytes 412.9
10
6
78
Traversing pro-
grams (20 blocks)
510 bytes 251
10
6
48
Note
SDB
w
1 000 (system data block, created for module replacement), contains
parameter data which were valid at the time of start-up. If data/parameters
are modified during operation and stored retentively on the FM 453, these
data are not contained in SDB
w
1 000. These modifications are lost when
the module is replaced, and should be traceable in the user program.
Retentive Storage
of Parameter Data
Description of Functions
Summary of Contents for SIMATIC FM 453
Page 6: ...vi FM 453 Servo Drive Step Drive Positioning Module C79000 G7076 C453 01 Preface ...
Page 14: ...xiv FM 453 Servo Drive Step Drive Positioning Module C79000 G7076 C453 01 Table of Contents ...
Page 378: ...Index 6 FM 453 Servo Drive Step Drive Positioning Module C79000 G7076 C453 01 Index ...