Bronkhorst EtherCAT - Manual (Page 14)

BRONKHORST ®
5 DEVICE PROFILE DS-404 SUPPORT
Bronkhorst instruments support the mandatory objects from the controller function block from CiA (draft) DS 404
V1.2, Measurement Devices and Closed Loop Controllers. These objects (0x6400 – 0x7405) are also listed in Appendix
A: Object Dictionary
Object 0x6406 contains a representation of the unit for current value and setpoint. This representation is based on
ETG.1004 EtherCAT Unit specification, which only contains SI units (see Appendix B: SI Unit AND Prefix Specification).
Bronkhorst instruments support a lot of non-SI units, which are described in Appendix C: Non-SI Unit Specification.
The unit is represented by an unsigned32 value with the following meaning:
Prefix Numerator Denominator reserved
31 24 23 16 15 8 7 0
Examples:
kg/s is represented by
Prefix Numerator Denominator reserved
0x00 0x02 0x03 0x00
with
Prefix = 0x00 means no prefix
Numerator = 0x02 means kg
Denominator = 0x03 means s
mln/min is represented by
Prefix Numerator Denominator reserved
0xFD 0xC0 0x47 0x00
with
Prefix = 0xFD means 10 -3 = milli
Numerator = 0xC0 means ln
Denominator = 0x47 means min
Page 14 EtherCAT interface 9.17.063