Installation / Preparation for Commissioning
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Page 20 of 91 TR-ECE-BA-GB-0163 v03 10/07/2020
3.2 EtherNet/IP™ transmission technology, cable specification
EtherNet/IP™ networks generally use an active star topology where a point-to-point connection links
the devices to a switch. One star topology advantage is that star topology supports devices with a
transmission rate of 10 Mbit/s as well as 100 Mbit/s. Devices using either of the two transmission rates
can also be combined, as most Ethernet switches automatically negotiate the transmission rate.
The measuring system also supports the Line (daisy chain) and Ring (DLR, optional) topologies.
Use category STP CAT5e patch cables (2 x 2 copper wire cables twisted in pairs and shielded) for
transmissions using the 100Base-TX Fast Ethernet standard. The cables are designed for bit rates of
up to 100 Mbit/s. The transmission velocity is automatically detected by the measuring system. The
shield needs to be earthed on one side only.
Transmit in full duplex mode. We recommend using switches with the following properties when
setting up the EtherNet/IP™ network:
• for the I/O communication:
- full duplex capability, on all ports
- IGMP snooping – restricts multicast data traffic to ports with an associated IP multicast group.
- IGMP Query – Routers (or switches) with active IGMP function periodically send queries to
find out which IP multicast group members are connected in the LAN.
- Port Mirroring – allows data traffic on one port to be mirrored to another port, important for
troubleshooting.
• other switch functions:
- e.g. redundant power supply
- Remote diagnostic capabilities
The EtherNet/IP™ Node ID can be set either via two rotary switches, flash configuration or DHCP.
The cable length between two nodes may be max. 100 m.
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