VDE 0411-500 BERICHTIGUNG 1-2009 Programmable controllers - Part 2: Equipment requirements and tests (IEC 61131-2:2007); German version EN 61131-2:2007@ Corrigendum to DIN EN 61131-2 (VDE 0411-500):2008-04
VDE 0411-500-2008 Programmable controllers - Part 2: Equipment requirements and tests (IEC 61131-2:2007); German version EN 61131-2:2007