Hydac ETS 3000 Series - Page 52

10 ETS 3000 IO-Link
Stand: 28.04.2020 HYDAC ELECTRONIC GMBH Mat. Nr.: 669904 D
In the SDCI mode a transmission of the process data is effected cyclically via the
communication pin 4 to the connected IO-Link master.
The ETS 3000 provides a process data width of 2 bytes. 14 bits are used for the actual
measured value ("PDV" = "Process data value"). The standard used is one decimal place.
2 further bits function as switching bits ("BDC" = "Binary digital channel"), which can be
parameterised just as physical transistor switches (please see chapter 9.2
Parameterisation in SDCI mode or chapter 0).
The process bits are arranged in one or 2 data words in accordance with Table 1. In order
to receive the physical measured value for further processing in the controller, a bit shift
operation must first be carried out for each data word (shift right 2).
Table 1 - IO-Link Process data structure, arrangement of der PDV and BDC bits
sub index bit offset data type name description
1 0 Boolean BDC1 Temperature – Switching bit 1
2 1 Boolean BDC2 Temperature – Switching bit 2
3 2 14-bit UInteger PDV1 Process value / fluid temperature
The figures below show the arrangement and the order of the bits and octets for the
version with a temperature sensor:
Octet 0
bit offset 15 14 13 12 11 10 9 8
sub index 3
element
bit
13 12 11 10 9 8 7 6
Octet 1
bit offset 7 6 5 4 3 2 1 0
sub index 3 2 1
element
bit
5 4 3 2 1 0
NOTICE
Direct access via the sub index number is not supported.