Siemens SIMATIC FM 351 - Start Commands for a Seek-Reference-Point Traverse

9
9-7
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
You can define a speed for the start of a seek-reference-point traverse:
 Start with creep speed.
 Start with rapid speed.
You call the seek-reference-point mode:
 In the mask for setting up the parameterization interface.
 With the FC REF_MODE.
The following commands are selected by edge control for the operating mode
Seek-reference-point:
Table 9-2 Start Commands for a Seek-Reference-Point Traverse
Start Com-
mand
Task Remarks
DIR_P The drive starts in the direction of
positive values, that is, it moves in
the direction of the end of the tra-
verse range.
If a negative direction is entered
in the machine data, the FM 351
signals an operating error. No
seek-reference-point traverse is
carried out.
DIR_M The drive starts in the direction of
negative values, that is, it moves
in the direction of the start of the
traverse range.
If a positive direction is entered in
the machine data, the FM 351 sig-
nals an operating error. No seek-
reference-point traverse is carried
out.
START The drive starts in the direction
entered in the machine data.
For incremental encoders the machine data Type of Seek-Reference-Point
Mode determines:
 The direction in which a seek-reference-point traverse must be started.
 The position of the encoder zero mark referred to the reference-point
switch.
Speeds
Calling the Seek-
Reference-Point
Mode
Start Commands
for a Seek-Refer-
ence-Point Tra-
verse
Type of Seek-Ref-
erence-Point Mode
Operating Modes and Settings