BECKHOFF DK9222-0311-0029 - Manual (Page 5)

I/O
Light
Application Note DK9222-0311-0029
EL6851-0000 DMX master
The EL6851-0000 DMX master terminal permits the direct connection of up to 32 DMX devices and supports transmission of
the full DMX protocol width of 512 bytes in just one control cycle using EtherCAT. The EL6581-0000 can send DMX frames
of any length and, as a result, the refresh rate can be varied in accordance with the application requirements. Thanks to its
support for the DMX512A standard and the RDM function (internal DMX diagnostics), the EL6851-0000 supports all common
DMX devices.
EL6851-0010 DMX Slave
The EL6851-0010 DMX slave terminal is the link to the DMX world and enables the integration of Beckhoff EtherCAT I/Os in
professional stage and effect lighting. The DMX slave terminal can be used under any DMX master in order to make the data
in the DMX telegram usable as process data for the controller. This allows the data to be used arbitrarily, for example for
outputting on digital outputs, stepper motors or dimmer terminals. As a result, theater and show stages can be constructed
with standard hardware at reduced cost, but with full flexibility.
Special features of the Beckhoff EL6851 DMX terminal
- Galvanic isolation of the RS485 interface eliminates the coupling of remote devices via earth loops.
- The required RS485 terminal resistor can be switched on in the terminal.
- RDM is already implemented
The internal DMX diagnostics and parameterization via RDM are possible with function blocks of the TwinCAT PLC library DMX.
However, the RDM protocol must be programmed in the controller, since the EL6851 exclusively offers Layer-2 functionality.
RDM (Remote Device Management)
Extension of the DMX protocol for central configuration/monitoring
of DMX devices:
– device addressing
– selection of different device profiles
– device parameterization
– error diagnostics
– monitoring of temperature, voltage, current and frequency
Fig. 5 RDM services
New Automation Technology BECKHOFF 5
For application notes see disclaimer on the last page