User Manual 08/2003 Edition

5
5 Description of the Functions 02.99 04.01
5.5 SIMODRIVE POSMO A functions
Setting actual
value by writing
into P40
Setting the
referencing
position to the
zero mark using
the traversing
block
(from SW 1.4)
Setting the actual
value using the
traversing block
(before SW 1.4)
5-144
The SIMODRIVE POSMO A positioning motor can be referenced at a
specific axis position by writing the required actual value into P40 (position
actual value).
For a stationary axis, this position is accepted as position actual value,
and after this, SIMODRIVE POSMO A is considered to have been referenced.
Move, e.g. using ”jogging” to the required axis position.
Reference the positioning motor by writing the actual value, valid for
this axis position, into P40 (position actual value).
Note
For ”set actual value”, the same conditions must exist as when
referencing, i.e. the drive must be closed–loop controlled and be
stationary.
The reference position can be set to a zero mark using the traversing
block as shown in the following program example.
Example:
Program control word (PSW) = 515dec (10 0000 0011bin)
P80:x
Bit 9 = 1 ––> set reference position
Bit 1 = 1 ––> relative
Bit 0 = 1 ––> enter position and velocity (closed–loop pos. contr.)
Target position = 100.0 mm P81:x
Velocity = 100 % P82:x
Acceleration = 100 % P83:x
Time = 0 ms P84:x
MeldPos = 50.0 P85:x
For this traversing block, the axis traverses through 100 mm relative. At
the end of the block, the setting value for the reference position is read
from ”MeldPos”, in order to correct the distance moved since the last
zero mark. The axis is then referenced.
This function corresponds to referencing an axis with reference cams
(refer to Table 5-7).
The actual value can be set via a traversing block as shown in the
above program example.
At the end of the block, the position, saved in ”MeldPos” becomes the
new actual position of the drive.
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SIMODRIVE POSMO A User Manual (POS1) – 08.03 Edition