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To:                  Subscribers PLCopen Newsletter

Subject:           PLCopen newsletter Issue June 2010



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PLCopen Newsletter - Issue June 2010



We need your feedback on the new PLCopen Function Blocks for Motion Control specification - Version 2.0


The success of the PLCopen Motion Control started with the release of the first specification in November 2001. Feedback from both users and implementers resulted in an update in 2005, Version 1.1. Also in 2005 the first release of Part 2 - Extensions, was published. This part is an addition to Part 1 and not so much a stand alone document.


New ideas, new functionalities and new feedback resulted in 2008 in the decision to merge Part 1 and 2 in a new specification, to be released as Part 1, version 2.0. Basically the two sets of function blocks have been merged. In addition, several changes were done. These changes include (however are not limited to): 

  • A new input "Continuous Update" to all relevant Function Blocks extending the behavior of the relevant motion related function blocks by the Execute and Enable functionality

  • A new Function Block CombineAxes, combining the motion of 2 axes into a 3rd axis with selectable combination method. Basically it is a calculation of a new position setpoint based on the position setpoints of the two input axes.

  • New Function Blocks ReadMotionState and ReadAxisInfo

  • New input MasterValueSource and corresponding datatype in MC_CamIn, MC_GearIn, MC_GearInPos, MC_ReadMotionState, and MC_CombineAxes

  • Split of MC_Phasing and MC_MoveContinuous Function Blocks in to both relative and absolute versions

  •  The simplification of the representation of the State Diagram, with a.o. the removal of the transition commands

  • Adopted description resulting in a changed behavior of the output Active

  • Aborting mode deleted in some Function Blocks and changes in the mcAborting enum

With these new functionalities, the PLCopen Motion Control profile can be used in additional application areas. Areas where the ease-of-use provided is unknown until now.


But before the official release we want to make sure that this fits your needs, meaning we want your comments. For this reason this new specification has been released for comments until August 16, 2010, combined with a feedback form for your input.

The document, as well as a feedback form, can be downloaded from our website.




Kind regards,


Eelco van der Wal

Managing Director PLCopen


PO Box 3009

NL 4200 EA Gorinchem, the Netherlands

tel.: +31-183-660261

fax: +31-183-664821



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