BECKHOFF EP2xxx - Manual (Page 8)

Foreword
Syntax of the batch number (D number)
D: WW YY FF HH
WW ­ week of production (calendar week)
YY ­ year of production
FF ­ firmware version
HH ­ hardware version
Example with D No. 29 10 02 01:
29 ­ week of production 29
10 ­ year of production 2010
02 ­ firmware version 02
01 ­ hardware version 01
EP2xxx 8 Version 2.1.0