BECKHOFF BK3xx0 - Manual (Page 58)

Notes on the Documentation
56 Fieldbus Components
Firmware Information
The following firmware information can be read through DPV1. The data is transferred in Intel format (low byte first):
Slot number Index Byte Description
0-1 Bus Coupler number
2-3 Software version
4-5 Manufacturer type (table 0, register 245)
6-7 Coupler type (table 0, register 246)
8-9 Bus Coupler type (table 0, register 247)
0 5
10-11 reserved