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To:
Subscribers PLCopen Newsletter ============================================== Welcome
to the PLCopen electronic newsletter. ============================================== What's new at PLCopen? A lot! PLCopen
is bustling with activities, read more in this in the following ezine. ============================================== PLCopen Newsletter - Issue November 2008. 2. TC2 Motion Control - Part 4 Coordinated Motion about to be released 3. TC5 Safety works on last issues to release the update of the basic specification ============================================== The
SPS/IPC/Drives in Nuremberg, Germany, will take place from November 25-27. -
"PLCopen combines logic, motion, safety and
exchange",
Presentation at the
SPS/IPC/Drives Forum program,
Wednesday 26 November, 10:00 at Forum Hall 2, booth 2-461 -
"PLCopen XML V 2.0
– new features, generic approach, AutomationML", Press conference, Wednesday
26 November, 15:00 at CCN Ost, level 2, Istanbul Please
visit our booth no. 660 in Hall 7. ============================================== 2.
TC2 Motion Control -
Part 4 Coordinated Motion about to be released In
April this year PLCopen released their Motion Control specification for
Coordinated Motion as release for comments. With this publication, the committee
could show their result for coordinated multi-axes motion in 3D space to a
broader audience, and request them to check the usability of this in their
environments. The feedback should overall increase the usability of the
specification. Based
on the comments received, PLCopen finalized the specification early November and
can now publish the results and release Part 4 Coordinated Motion as version 1.0 Other
parts of the PLCopen Motion Control suite deal with master
/ slave motion control, a type of coordinated motion control where the
master axis position is used to generate one or more slave axis position
commands. For three dimensional movements, one goes beyond this point via a
grouping of a set of axes, without a master axis. In order to work in 3D, one
has to use several coordinated systems, as well as a kinematic model of the
mechanics involved. The coordinated systems include the axes coordinate system,
the machine coordinate system and the product related system. The
current Master/Slave axes have the problem that if an error occurs, the other
axes have no knowledge about this, and continue their movement. By combining
axes in a group one knows upfront which axes are involved and has the basis for
a better error behavior. ============================================== 3.
TC5 Safety works on last issues to release the update of the basic
specification The
PLCopen Technical Committee 5 (TC5) deals with Safe Software. They published
their first functional safety software standard in the beginning of 2006. Now an
update is scheduled to be published, due to feedback from implementations as
well as additional user wishes. The
document itself provides a deep level of description. It does not only describe
the functionalities, but also includes full state diagrams which add to the
understanding, references to the applicable standards, description of error
behavior, functional checks, and error codes, and identifies different
programming levels. As such it is an ideal platform for implementers. For users,
additional information on safety devices, connections and wiring is of course
needed. The
first five chapters of the specification contain the software model, the subset,
and the concept of generic Function Blocks. The remainder two chapters define
the specific Function Blocks, 20 in total, as well as the PLCopen certification
procedure. Via
this specification we help users to achieve their functional safety at the plant
and machine level more easily and independent of the underlying architecture.
The easy-to-use interface to the safety functionality supports this. The
concepts will be (re-) usable in a wide range of applications, providing a
common basis, terminology, and references. The accepted functionality and
concepts will be approved by certification bodies, providing the basis for
certifiable Function Blocks, User Levels and lower certification cost at the
user. The
official PLCopen safety software specification is expected to become available
beginning 2009 for downloading free of charge at the PLCopen website www.plcopen.org. ============================================== Within TC4 PLCopen started cooperation with OPC UA to make it easier to interface the different tools used. The kick-off meeting was held on October 14, where the working group
objectives and the working plan (milestones) were discussed decided upon. The overall goal of this cooperation is to define an IEC 61131-3 based information model as
additional part of the overall OPC UA specification. Another objective is to
define Communication Function Blocks representing OPC UA access methods in order
to enable communication between PLCs during runtime. ============================================== The
PLCopen Technical Committee (TC6) - XML opened up the IEC 61131-3 development
environments by specifying the XML schema for this. As such it provides an open
interface to other software tools. PLCopen TC6 published their XML schema and
documentation in June 2005 as version 1.01. After that, feedback came in from
companies starting to implement this specification, not only from Europe but
also from Japan. With
a new initiative called AutomationML we have come to a new phase. The companies
Daimler, ABB, KUKA, Rockwell, Siemens, netAllied and Zühlke together with the
University of Karlsruhe and the University of Magdeburg jointly define and
standardize the Automation Markup Language (AutomationML) as an intermediate
format for the Digital Factory. For more information check www.automationML.org. One
of the formats that have been accepted in this group is PLCopen XML for the
sequencing. In order to optimize this interface, additional changes to the
specification were proposed. These
proposals now result in a new release of the PLCopen XML schema. This schema
also includes previous feedback on this schema from other parties involved. With
this release an optimization between the simulation and realization is created,
creating more efficiency in automation. The release consist of a technical
specification, the XML schema, and a document describing this schema, and can be
downloaded free of charge from the website www.plcopen.org. ============================================== Kind
regards, Eelco van der Wal email:
evdwal@plcopen.org |
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