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Fieldbus Communication

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Fieldbus communication between IOC of the control application and fieldbus

coupler occurs via the application protocol PROFINET IO.

In addition, there are also other standard ETHERNET protocols implemented,

which on the one hand provide the basis for the PROFINET IO communication

and on the other hand, serve the reliable data transmission and the network

management.

All available protocols are briefly described in the following sections.

11.1

Standard ETHERNET Protocols

11.1.1

IP, TCP and HTTP

•

The fieldbus coupler supports the Internet Protocol (IPv4) acc. to RFC791.

TCP

•

The fieldbus coupler supports the TCP Protocol acc. to RFC 675, RFC 793,

RFC 1122, RFC 2581, RFC 5681.

HTTP

•

The implemented HTTP server is used for reading out the HTML pages,

which are stored in the fieldbus coupler. The HTML pages provide

information about the fieldbus coupler, such as status and configuration.

The HTTP server uses port number 80.

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11.1.2

DCP

Via DCP, to still unaddressed devices in a PROFINET IO system can be

distributed addresses and names, so that they are then accessible and able to

communicate via the IP protocol in the network. DCP provides various services

for request and assignment of address information, such as the DCP_Identify

request and the DCP_Get and DCP_Set services.

After the first supply voltage application, the fieldbus coupler is in state of factory

setting, that means the device name (Name Of Station) is not available (empty

string, NIL) and the IP settings "address", "subnet mask", and "default gateway"

each are set to 0.0.0.0.

The fieldbus coupler is only reachable via ICMP if a device name and valid IP-

settings are assigned via DCP_Set services.

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Manual

Version 2.0.0

Fieldbus Communication

129

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