BECKHOFF EL9xxx - Manual (Page 72)

Mounting and wiring
Marking
The Beckhoff fieldbus components certified for potentially explosive areas bear one of the following
markings:
II 3 G Ex nA II T4 KEMA 10ATEX0075 X Ta: 0 ­ 55°C
or
II 3 G Ex nA nC IIC T4 KEMA 10ATEX0075 X Ta: 0 ­ 55°C
Serial number
The Beckhoff fieldbus components bear a serial number that is structured as follows:
WW YY FF HH
WW ­ week of production (CW, calendar week)
YY ­ year of production
FF ­ firmware version
HH ­ hardware version
Example with ser. no.: 35 04 1B 01:
35 ­ week of production 35
04 ­ year of production 2004
1B ­ firmware version 1B
01 ­ hardware version 01
EL9xxx 72 Version 3.1