Incremental Dimensions; Limits For Entry Of Incremental Dimensions - Siemens SIMATIC FM 351 Installation Manual

8.7

Incremental Dimensions

Definition
Incremental dimensions are specified target values which can be approached
by the FM 351 with the relative or absolute incremental operating mode.
You have the possibility of entering a maximum of 100 incremental dimen-
sions in a table.
Requirements for
When entering the incremental dimensions, please note the following re-
Incremental quirements:
Dimensions
Figure 8-1 Limits for Entry of Incremental Dimensions
Interpretation of Depending on which incremental mode you select, the FM 351 interprets the
the Incremental
value differently.
Dimensions
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
The target that is to be approached must:
– Be more positive than the Software Limit Switch Start plus half the
target range
and
– Be more negative than the Software Limit Switch End minus half the
target range.
target range
Tar-
SLS
get
1 2 Range in which targets may be located
Working range
No target may be located in this part of the working range.
Absolute incremental mode: The incremental dimensions are interpreted
as absolute target positions in the coordinate system.
Relative incremental mode: The incremental dimensions are interpreted
as differences in displacement from the start position.
Machine Data and Increments
0
target range
Tar-
SLE
get
1
2
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