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PLCopen Safe Motion: first specification released

31 July 2017

The PLCopen Safe Motion version 1.0  specification  can now be downloaded from the PLCopen website.

The introduction of safety approved networks makes the control of drives and motion ever more of a software item. Hard-wired systems are replaced by software commands over networked systems. However, the different networks come with different solutions, which can create problems for users in the production environment where there are often a great variety of networks in use. 

To overcome this issue, the Safe Motion PLCopen working group created a generic proposal to solve the motion control safety aspects over the different networks like ProfiSafe, Safety over Ethercat, CIP Safety over Sercos, OpenSafety, CC-Link IE and Mechatrolink, as well as user area’s as described in OMAC.

Also there are many Safe Motion related commands, and it makes no sense that a function block is created for all of them while the functionality is mostly the same. The new solution is based on an existing functionality as already specified in PLCopen Safety: SF_SafetyRequest. With this most of the safety drive functionalities can be mapped easily, especially by providing a guideline with defined naming conventions, containing a generic scheme how to name signals related to the functions supported by a safety drive. 

Combined with an I/O or Drive configurator these names can be generated automatically for the bits in the drive‘s status/control word, matching the drive‘s profile. 

This work is a continuation of the PLCopen Motion and PLCopen Safety activities, which both resulted in a suite of specifications. Inside these published specifications the safety aspects around motion have been described only partially. This new document fills this gap.

Click this link to download the specification. 

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