DIN EN 62439-4/A1 : 2013 Title: Industrial communication networks - High availability automation networks - Part 4: Cross-network Redundancy Protocol (CRP) (IEC 62439-4:2010/A1:2012); English version EN 62439-4:2010/A1:2012 Year: 2013 Publisher: DIN Media GmbH Availability: Within 1-2 working days