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8-9
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
Table 8-3 Machine Data for the Axis, continued
Machine Data and
Assignment
Description
Starting velocity for seek-
reference-point travel:
Rapid speed
Creep speed
With this data you select the velocity for the start of a seek-reference-point travel:
Rapid speed
Creep speed
Software limit switch
Start / Software limit
switch End
– 1,000,000.000 mm
to
1,000,000.000 mm
–1000,000 1000,0000
SLESLS
Axis
Working range
This entry is only of significance with a linear axis.
The software limit switches are active when the FM 351 is synchronized. We term the
range set by the software limit switches the working range. The limits of the working
range are monitored by the FM 351.
The Software Limit Switch Start (SLS) must always be more negative than the Software
Limit Switch End (SLE).
Absolute encoder (SSI)
The FM 351 is synchronized directly after parameterization. The software limit
switches are monitored from this point in time.
The absolute encoder which you use must at least cover the working range (from Soft-
ware Limit Switch Start to Software Limit Switch End).
Relationship: Encoder range, Travel range, Number range
The working range is the range which you define for your task using the software
limit switches.
The encoder range is the range unambiguously covered by the encoder.
The number range is the value range which the FM 351 can process. It is depen-
dent on the resolution.
The travel range is determined by:
– Encoder range if the encoder range is smaller than the number range.
– Number range if the encoder range is larger or the equal to the number range.
Incremental encoder
The axis is initially not synchronized after each FM 351 start. The parameterized soft-
ware limit switches are only monitored after synchronization.
Machine Data and Increments
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