
7
Project planning and startup with MOVITOOLS
®
MotionStudio
Startup of the fieldbus at the DHR21B/41B controller
Manual – DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
55
Auto-crossing
The two ports leading out of the Ethernet switch have auto-crossing functionality. This
means that they can use both patch and cross-over cables to connect to the next Eth-
ernet node.
Auto-negotiation
The baud rate and duplex mode are negotiated by both Ethernet nodes when estab-
lishing the connection. For this purpose, both Ethernet ports of the EtherNet/IP con-
nection support an auto-negotiation functionality and work with a baud rate of either
100 Mbit or 10 Mbit in full duplex or half-duplex mode.
Notes on multi cast handling
•
The integrated Ethernet switch does not provide a filter function for Ethernet mul-
ticast telegrams. Multicast telegrams that are usually sent in Ethernet/IP networks
from the adapters to the scanners (PLC) are passed on to all switch ports.
•
IGMP snooping (e.g. Managed Switches) is not supported.
•
SEW‑EURODRIVE therefore recommends to connect the DHR21B/41B option in
EtherNet/IP networks only with network components that support IGMP snooping
(e.g. managed switch) or that have safety mechanisms integrated against excess
multicast load (e.g. devices from SEW‑EURODRIVE). Devices that do not have
this integrated function can fail due to high network loads. This restriction does not
apply to PROFINET IO or Modbus/TCP networks.
7.5.2
TCP/IP addressing and subnets
Introduction
The settings for the address of the IP protocol are made using the following paramet-
ers
•
MAC address
•
IP address
•
Subnet mask
•
Standard gateway
The addressing mechanisms and subdivision of the IP networks into subnetworks are
explained in this chapter to help you set the parameters correctly.
MAC address
The MAC address (Media Access Controller) is the basis for all address settings. The
MAC address of an Ethernet device is a worldwide unique 6-byte value (48 bits). The
MAC address of SEW Ethernet devices is 00-0F-69-xx-xx-xx. The MAC address is dif-
ficult to handle for large networks. This is why freely assignable IP addresses are
used.
IP address
The IP address is a 32-bit value that uniquely identifies a node in the network. An IP
address is represented by 4 decimal numbers separated by decimal points.
Example: 192.168.10.4
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