Beckhoff EtherCAT EL600x Series - Fig. 1 EL5021 el Terminal, Standard IP20 IO Device with Serial Batch Number and Revision ID (Since 201401); Fig. 2 EK1100 Ethercat Coupler, Standard IP20 IO Device with Serial Batch Number; Fig. 3 CU2016 Switch with Serial Batch Number

Foreword
EL600x, EL602x 11Version: 4.6
Examples of markings
Fig.1: EL5021 EL terminal, standard IP20 IO device with serial/ batch number and revision ID (since
2014/01)
Fig.2: EK1100 EtherCAT coupler, standard IP20 IO device with serial/ batch number
Fig.3: CU2016 switch with serial/ batch number