PRP and HSR version 1 (IEC 62439-3 Ed.2), improvements and a prototype implementation

The IEC62439-3: Industrial communication networks - High availability automation networks - Part 3: Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy (HSR), defines two protocols which provides zero time recovery against a failure in the network. The first edition of the standard was published in 2010, and two years after a second edition has been published in July 2012. There have been some improvements which explain this actualization and an amendment between versions. This paper presents the most remarkable improvements included, others susceptible of being included and a software prototype to be run in PCs and/or FPGAs which implements this new version of the protocols.