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6
Transparent Ethernet
6.1
General Information
Transparent Ethernet offers the possibility for a host application, that includes an IT implemen-
tation, to let the Anybus CompactCom handle an industrial Ethernet protocol (in this case Mod-
bus-TCP), without the need for extra Ethernet ports.
Ethernet communication that is not related to Modbus-TCP is internally routed via the RMII in-
terface to the Ethernet port and the TCP/IP stack of the host application. The IP configurations
and the MAC addresses of the host application and the Anybus CompactCom must be the
same.
The RMII interface is accessed through the host application connector. Please note that the 16
bit parallel interface is not available when transparent Ethernet is enabled. See the
Anybus
CompactCom M40 Hardware Design Guide
for more information.
Safety black channel
Industrial Ethernet communication
Other Ethernet communication
Anybus
CompactCom 40
Host Application
Network
connector
Anybus host connector
RMII
Router
Industrial
Ethernet
software
Application
software
TCP/IP
RMII
Fig. 1
Transparent Ethernet has to be enabled by setting instance attribute #16 in the
Anybus Object (01h) during setup, see below.
16–bit parallell mode cannot be used when using transparent Ethernet.
MAC addresses and IP configurations have to be synchronized, see below.
Some EtherTypes ,TCP/UDP ports and multicast MAC addresses may be
reserved for use by the industrial Ethernet network. These must not be used for
transparent Ethernet communication. See below for more information.
Anybus
®
CompactCom
™
40 Modbus-TCP
®
Transparent Ethernet Network Guide
SCM-1202-022 1.1