Siemens SIMATIC FM 351 - Page 112

Modes and Jobs
9-26
FM 351 Positioning Module
C79000-G7076-C351-02
Effects of the Job
Based on the example of “set reference point” to 400 mm, you can see how this
job projects the working range to a specific physical position on the axis. It
produces the following effects:
• The actual position is set to the value of the reference-point coordinate.
• The working range is offset on the axis.
• The individual points (for example software limit switch end) retain their original
value but are located at new positions.
• The SYNC bit is set in the return signals.
Table 9-5 Shifting the Working Range on the Axis Using “Set Reference Point”
set reference point
SLS ACT SLE
Projection of
the working
ran
g
e b
y
Set
SLS
ACT
SLE
Axis
0
500–500
200
[mm]
Old coordinate system
-400 200 400
range
by
Set
reference point
to 400 mm
0
400
–500
New coordinate system
SLEACT=
SLS
500
-400 400 400
Note on Absolute Encoders
This job is necessary for an absolute encoder adjustment (see section 8.6, page
8-19).