
Manual – Controllers DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
41
4
Installing the DHR21B/41B option
Assembly and Installation Notes
DIP switch 2
1
(protocol)
DIP switch "2
1
" is used to set the fieldbus protocol that is currently used.
•
2
1
= "1" (= right = ON): The EtherNet/IP / Modbus TCP/IP fieldbus protocol is active
•
2
1
= "0" (= left = OFF): The PROFINET fieldbus protocol is active.
4.9.4
The integrated Ethernet switch
You can use the integrated Ethernet switch to achieve line topologies known from the
fieldbus technology via X30-1 and X30-2. Other bus topologies, such as star or tree, are
also possible. Ring topologies are not supported.
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
Ethernet station.
Auto-negotiation
The baud rate and the duplex mode are negotiated by both Ethernet nodes when
establishing the connection. For this purpose, both Ethernet ports of the EtherNet/IP
connection 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 multicast
handling
•
The integrated Ethernet switch does not provide a filter function for Ethernet
multicast 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 (managed switch) 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. units from SEW-EURODRIVE). Units 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.
INFORMATION
The number of industrial Ethernet switches connected in line impacts the telegram
runtime. If a telegram passes through the units, the telegram runtime is delayed by the
store & forward function of the Ethernet switch:
•
For a telegram length of 64 bytes by approximately 10 µs (at 100 Mbit/s)
•
For a telegram length of 1500 bytes by approximately 130 µs (at 100 Mbit/s)
This means that the more units a telegram has to pass through, the higher the
telegram runtime is.
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