Siemens SIMATIC FM 351 - Incremental Dimensions; Incremental Dimension Number 1 to 100

Machine Data and Incremental Dimensions
8-24
FM 351 Positioning Module
C79000-G7076-C351-02
8.8 Incremental dimensions
Definition
Incremental dimensions are targets that can be approached by the FM 351 in the
absolute/relative incremental approach modes.
Requirements for Incremental Dimensions
The positioning target must be at a location corresponding to at least half the
target range before the software limit switch.
SLS SLE
Range in which targets may be located
Working range
1
2
1/2 target
range
1 2
Target
Target
1/2 target
range
No target may be located in this part of the working range.
0
Figure 8-1 Limits for Entry of Incremental Dimensions
8.8.1 Incremental dimension number 1 to 100
You can enter a maximum of 100 incremental dimensions in a table that are valid
both for the relative incremental approach and the absolute incremental
approach modes.
Note that the FM 351 does not allow any negative values for the relative
incremental approach. The values are interpreted by the FM 351 depending on
the direction of movement as positive or negative differences.
Note
The entry is made in the appropriate unit for the selected system of units. Make
sure that the decimal places are correct.
Example:
Incremental dimension 800 mm
Units 10
–3
mm
Entry in the parameter DB 800000
Recommendation: Define separate ranges for relative and absolute increments in
the incremental dimension table.