HYDAC ELECTRONIC EDS 3000 - Operation Modes; SDCI-Mode; SIO Mode

10 EDS 3000 IO-Link
Status: 2022-07-14 HYDAC ELECTRONIC GMBH Part no.: 669897
11 Operation modes
11.1 SIO mode
After start-up, the pressure switch is in SIO mode (standard I/O mode). In this mode,
Pin 4 serves as a switching output.
 The centre LED is constantly lit.
According chapter 15 Basic Settings the behaviour of the EDS 3000 can be adjusted to
the corresponding application.
11.2 SDCI-Mode
Via a connected IO-Link master the pressure switch can be switched to the SDCI mode
(Single-drop digital communication interface for small sensors and actuators), also
known as "IO-Link mode", by means of a wake-up signal. In this mode, Pin 4 serves as
a communication pin. The master is able to communicate with the pressure switch in
order to change parameters or to read out measured values.
 The centre LED flashes.
In the SDCI mode a transmission of the process data is performed cyclically via the
communication pin 4 to the connected IO-Link master.
The EDS 3000 provides a process data width of 2 bytes. 14 bits are used for the actual
measured value ("PDV" = "Process data value"). The number of decimal places used is
based on the measuring range and can be taken from the device description file
(IODD).
2 further bits function as switching bits ("BDC" = "Binary digital channel"), which can be
parameterised just as physical transistor switches (please see chapter 12
Parameterisation).
The process bits are arranged in one data word in accordance with Table 1. In order to
receive the pressure 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 the PDV and BDC bits
Octet 0
Octet 1
bit offset
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
subindex
Measured value (PDV - Process data value)
BDC2
BDC1
element
bit
13
12
11
10
9
8
7
6
5
4
3
2
1
0
The switching bits BDC1 and BDC2 as well as the physical switching outputs
SP1 and SP2 are internally coupled to each other. Changes to the BDCs will
automatically affect the SPs and vice-versa. If the IO-Link block parameterisation
is used, changes to the switch settings should absolutely be carried out equally
on both output variables (BDC and SP). For reference, please see Annex: IODD
Setting Parameters (notes "modifies other variables").