Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
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of 820
4
Types of sequential positioning
The setting, whether a sequential positioning shall occur "absolute/relative", will be set in
Z149.2– Mode bit 4.
Bit 4 = 0: Absolute sequential positioning
Bit 4 = 1: Relative sequential positioning
Absolute positioning using Z149.3– Spindle angle position
Only the Low-Word of the spindle angle position is copied in the Low-Word of the effective
target position. The High-Word is not used at the time.
In order to start an absolute sequential positioning the control bit 11 must be set (positive
edge). The positioning direction is determined with bit
0 and 1 of the Z149.2– Mode.
00: Towards greater position set values
01: Towards smaller position set values
10: Shortest distance
11: Reserved (value is incorrect and is not accepted)
Relative positioning using Z149.9– Spindle relative offset
Dependent on the preset direction the new target position is calculated from the last target
position plus or minus spindle relative offset. Only the Low-Word is used from
Z149.9–.
A positive edge in the control bit 11 is necessary in order to start.
The positioning direction is determined only with bit 0 of the Z149.2– Mode.
0: Towards greater position set values:
1: Towards smaller position set values
4.8.5.1 Parameter overview
Functional block: FbSpindlePos [149]
NOTE!
The value of bit 4 (sequential positioning absolute/relative) in Z149.2– Mode is irrel-
evant at switching in the operating mode spindle positioning. At the first spindle posi-
tioning it will be positioned always absolute to the spindle angle position! The actual
direction of revolution remains thereby. A reversion is not possible.
If the motor is in standstill (standstill message is existent) at switching, bit 0 and 1 of
Z149.2– decide on the positioning direction.
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