Incremental Operating Mode - Siemens SIMATIC FM 351 Manual

9.4

Incremental Operating Mode

Definition
With the "incremental approach", the FM 351 can do the following:
Move the drive to absolute targets,
Move the drive relatively by a distance in a specified direction.
The target or the relative distances are specified for the FM 351 as incremental
dimensions. 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. Regardless of the incremental dimension table,
you can specify the distance using the incremental dimension 254 and 255 (see
Section 8.8, page 8-24).
Requirements
You have set the parameters for the axis.
The axis must be synchronized.
The incremental dimensions must exist on the module.
Interpretation of the Incremental Dimensions
Depending on which incremental approach you select, the FM 351 interprets the
information differently.
Absolute incremental mode: The incremental dimensions are interpreted as an
absolute target position.
Relative incremental mode: The incremental dimensions are interpreted as a
relative distance from the start position.
Note
For the "relative incremental approach" mode, only positive incremental
dimensions are permitted. The sign for the incremental dimensions is obtained
from the specified direction DIR_P or DIR_M.
FM 351 Positioning Module
C79000-G7076-C351-02
Modes and Jobs
9-17