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 - Beckhoff EK18 Series Documentation