Siemens SIMATIC FM 351 Manual page 98
Positioning module
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Also See for SIMATIC FM 351:
- Getting started (6 pages) ,
- Installation manual (170 pages) ,
- Getting started (20 pages)
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Modes and Jobs
3. Enter the start speed.
– Rapid (REFPT_SPD=0)
– Creep (REFPT_SPD=1)
4. Write and activate the machine data.
5. Set the control signal for the "reference point approach" mode (MODE_IN=3).
6. Set the control signal for drive enable (DRV_EN=1).
7. Set the function switch for "do not evaluate enable input"
(EI_OFF=1) or wire up the enable input for the relevant channel.
8. Set the control signal for the travel direction plus or minus or the start signal
(DIR_P=1, DIR_M=1 or START=1)
9. Call FC ABS_CTRL.
Table 9-2
Start Commands for a Reference Point Approach
Start
Command
DIR_P
DIR_M
START
Note
The following applies for a rotary axis: The reproducibility of the reference point is
only guaranteed if an integral ratio exists between the value end of rotary axis
and the value distance per encoder revolution.
9-12
Task
The drive starts in the direction of
more positive values; in other words,
it moves in the direction of the end of
the travel range.
The drive starts in the direction of
more negative values; in other
words, it moves in the direction of the
start of the travel range.
The drive starts in the direction
entered in the machine data.
Remark
If a negative direction is entered in
the machine data, the FM 351
signals an operating error. No
reference point approach is carried
out.
If a positive direction is entered in the
machine data, the FM 351 signals an
operating error. No reference point
approach is carried out.
FM 351 Positioning Module
C79000-G7076-C351-02
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