Bronkhorst EtherCAT Manual do Utilizador descarregar pdf (Página 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

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