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Description of Functions
Retentive Storage
Please note the following when using the function "Write parameters and
of Parameter Data
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
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
Block sizes:
DB Machine data
DB Increments
DB Tool offset data
DB Traversing programs
Example:
Assuming a service life of 10 years and 24-hour operation, a typical limit =
10
MD
Traversing pro-
grams (20 blocks)
Note
SDB
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
the module is replaced, and should be traceable in the user program.
9-38
5
, typically 10
=
Block size (in bytes), in which param-
eter data are modified
6
.
Parameterization
DB size
data
310 bytes 412.9 10
510 bytes 251 10
1 000 (system data block, created for module replacement), contains
6
. The possible number of delete/re-
6
128 000 10
(typical)
approx. 310 bytes
approx. 460 bytes
approx. 310 bytes
110 + (20 x no. of traversing blocks) bytes
Number of possible de-
Number of possible de-
lete/reprogram cycles
lete/reprogram cycles
6
78
6
48
1 000. These modifications are lost when
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
per minute
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