BS-EN-61158-6-20 Complete Document History
Industrial communication networks. Fieldbus specifications

Complete Current Edition:
   2014 EDITION - Application layer protocol specification. Type 20 elements - Nov. 30, 2014

Obsolete Revision Information:
   2012 EDITION - Application layer protocol specification. Type 20 elements - July 31, 2012
   2008 EDITION - Application layer protocol specification. Type 20 elements - June 30, 2008