Siemens SIMATIC FM 353 Manual page 60

Defining Parameters
Table 5-1
Data block
DB-SM
DB-TO
DB-NC
System data
block
SDB w 1 000
DB-SS
DB 1249
5-8
Data blocks, continued
Increments (DB No. = 1230)
User memory requirements = 468 bytes
Increments serve in the "Relative incremental" operating mode as user-
definable relative path distances for individual positioning. You can de-
fine from 1 to 100 increment sizes (see Section 5.3.2).
Modifications can be made in all operating modes (even in "Incremental
relative" mode) during movement. The modifications of the increments
must always be complete before a new movement is started in "Incre-
mental relative" mode. If this is not the case, the error message "incre-
mental dimensions do not exist" is output Cl. 2/No. 13.
Tool offset data (DB No. = 1220)
User memory requirements = 308 bytes
The use of tool length compensation and wear values is described in
Section 10.1. Up to 20 compensation or wear values are available.
Tool offset data are required for the "Automatic and Automatic single
block" modes.
Modifications can be made in all operating modes and during movement.
If modifications are made during starting or at block transitions when the
tool compensation is active (internal access to offset values), the error
message "tool offset value does not exist" is output Cl.3/No.35.
Traversing programs
(Program No. + 1000 = DB No. = 1001...1199)
User memory requirements = 108 + (20 x no. of traversing blocks)
Traversing programs are required for the "Automatic and Automatic
single block" modes.
S
Programs which are not selected can always be modified.
S
If modifications are made to a preselected program, including the
subprogram, preselection of the program is canceled. You must then
select the program again. A modification can be made to a program
when BL = 0 (start of program/end of program) and on Stop.
For module replacement without PG
All the parameter data of the FM 353 (DB-MD, DB-SM, DB-WK, DB-NC)
are stored in SDB w 1 000. This SDB is loaded into the CPU and is used
as an additional means of data storage.
Data block for status messages (DB no. 1000)
The DB-SS is an internal DB on the FM for testing, start-up and operator
control and monitoring.
Internal DB on the FM, not relevant for user.
Significance
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0