Stober MDS 5000 - Principle of Operation

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POSITool over EtherCAT

Operation manual

ID 441896.05

WE KEEP THINGS MOVING

12.5 Principle of operation

EtherCAT makes possible:

• The cyclic transfer of process data (PDO) using a controller or CNC

• Acyclic services for writing and reading parameters in the inverter using CoE

(SDO) as well as the transfer of manufacturer-specific protocols (VoE,

Vendor-specific protocol over EtherCAT).

Using the VoE technology it is possible to establish communication between

POSITool on the PC with the EtherCAT master and devices in the 5

generation

of STÖBER inverters. Using this communication link, you can undertake all the

usual actions such as configuration download, configuration upload, diagnostics

and commissioning. In this situation the EtherCAT master represents the gateway

via which communication is established.

Fig. 12-6 EtherCAT master and POSITool

Driver software is included in POSITool for communication with the inverters; on

sending data this driver packs the inverter messages into the so-called Vendor-

specific protocol over EtherCAT. The VoE messages are sent via UDP/IP to the

mailbox gateway in the TwinCAT

software. The mailbox gateway forwards the

VoE messages via the EtherCAT master to the related inverters. The inverters

reply with VoE messages to the EtherCAT master. There the mailbox gateway

receives the reply messages and sends them back to POSITool. For this method

of communication to function, POSITool must know both the IP address of the

mailbox gateway and the address of the required inverters in the EtherCAT

system.

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