
Virtual CCD slave (local axis) for
dead-time compensation
●
In order to achieve synchronized (optimized for dead-time) command
value processing for all axes in the MLD-M system mode, the local axis
is commanded in the CCD master via CCD (sercos III) along with the re‐
mote axes (CCD slaves).
●
The data contents of all axes are updated in the course of the MDT/AT
telegrams of cross communication (CCD). This makes the access to the
axes (CCD master and slaves) synchronous.
Fig. 5-5:
Accessing local and remote axes using the "AxisData" structure
When using a motion task in synchronism with master communi‐
cation or a motion task in synchronism with CCD (see chapter
"Basic functions of Rexroth IndraMotion MLD" section
), the "AxisData" structure is pro‐
cessed synchronously to task processing. This means the actual
values of the "AxisData" structure are updated at the beginning of
the task, and the command values are written at the end of the
task. With all other tasks, the axis data are not processed syn‐
chronously to the task; this has to be ensured using correspond‐
ing accesses in the program.
Pertinent function blocks
The "AxisData" structure is not accessed via function blocks, but
via direct access to the data structures.
Structure of AxisData
The structure type "MX_AXISDATA" is defined in "MX_Base".
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Rexroth IndraDrive Rexroth IndraMotion MLD (2G) as of MPx-18
MLD communication interfaces and data channels
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