Siemens SIMATIC S7-300 Manual page 59

Table 5-1
DB-SM
DB-WK
DB-NC
System data
block
SDB
DB-SS
DB 1249
FM 354 Servo Drive Positioning Module
Data blocks, continued
Data block
Increments (DB No. = 1230)
Block size (rounded in bytes) = 460
Increments serve in the "Relative incremental" operating mode as
user-definable relative path distances for individual positioning.
You can define from 1 to 100 increment sizes (see Section 5.3.2).
Modifications can be made in all operating modes (even in "Incre-
mental relative" mode) during movement. The modifications of
the increments must always be complete before a new movement
is started in "Incremental relative" mode. If this is not the case, the
error message "incremental dimensions do not exist" is output Cl.
2/No. 13.
Tool offset data (DB No. = 1220)
Block size (rounded in bytes) = 310
The use of tool length compensation and wear values is described
in Section 10.1. Up to 20 compensation or wear values are avail-
able.
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)
Block size (rounded in bytes) = 110 + (20 x no. of traversing
blocks)
Traversing programs are required for the "Automatic and Auto-
matic single block" modes.
Programs which are not selected can always be modified.
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 pro-
gram) and on Stop.
For module replacement without PG
All the parameter data of the FM 354 (DB-MD, DB-SM, DB-WK,
1 000
DB-NC) are stored in SDB
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.
Defining Parameters of the FM 354
Significance
1 000. This SDB is loaded into the
5-7