Port Definition Twincat 2.11; Setup: Device Ethercat; Fig. 35 Information Window "Online Description - Beckhoff CU2508 Documentation

Commissioning
4.2

Port definition TwinCAT 2.11

4.2.1

Setup: Device EtherCAT

Table of contents
• Notes on the EtherCAT device [} 32]
• Setting up an EtherCAT device [} 32]
• Configuration settings under TwinCAT 2.11R2 [} 33]
• Distributed Clocks behavior [} 35]
• EoE settings [} 36]
A downlink port of the CU2508 is set up as an EtherCAT device. The correct setup of the CU2508 [} 29]
device is assumed.
Notes on the EtherCAT device
• The CU2508 downlink port appears as the first regular EtherCAT slave. It can optionally represent the
Distributed Clocks reference clock in this EtherCAT system. The port has no controllable I/O.
• All CU2508 downlink ports are synchronized with each other.
• A second CU2508 port can be used as a ring closure for EtherCAT cable redundancy. The primary
EtherCAT connection must then be connected to an odd CU2508 port (X1, X3 etc.) and the secondary
redundancy adapter to the following even CU2508 port (refer to the corresponding chapter Device
EtherCAT with cable redundancy [} 37]).
• The CU2508 sends EtherCAT frames in pass-through mode without time stamps.
Setting up an EtherCAT device
In EtherCAT operation the CU2508 downlink port used is not transparent, but appears as a Distributed
Clocks-capable EtherCAT slave in the configuration. As a result it can appear as a reference clock.
However, the EtherCAT slave is otherwise not parameterizable or addressable.
As applies to every EtherCAT device, the current ESI xml files should be present in the TwinCAT system for
the CU2508 also. This applies both to the offline creation of the configuration and to scanning in online
operation. The files (in particular "Beckhoff CUxxxx.xml") can be procured from the download area on the
Beckhoff web page. They are to be saved under "... \ TwinCAT\Io\EtherCAT\".
Updating the ESI XML files
If the following information window should appear in online mode when scanning the devices on the
CU2508: (see Fig. Information window "Online description") then an update for above mentioned
file is necessary:
Click on "No", close the System Manager window, install the current ESI xml files and create the
configuration in a newly opened System Manager window.
Fig. 35: Information window "Online description"
Creation of the configuration
The simple option to create the configuration by scanning the real hardware is only possible if an
EtherCAT device is manually connected to a CU2508 port in the configuration.
32 Version: 2.6 Real-time Ethernet port multiplier