![SEW-Eurodrive DHR41B Скачать руководство пользователя страница 13](http://html.mh-extra.com/html/sew-eurodrive/dhr41b/dhr41b_manual_1250086013.webp)
Manual – MOVI-PLC® advanced DHR41B for EtherNet/IP, Modbus/TCP and PROFINET IO
13
4
The integrated Ethernet switch
Assembly and Installation Notes for Ethernet
4.4
The integrated Ethernet switch
You can use the integrated Ethernet switch to achieve line topologies known from the
fieldbus technology. 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 Ether-
net station.
Auto-negotiation
The baud rate and the duplex mode is negotiated by both Ethernet nodes when estab-
lishing the connection. For this purpose, both Ethernet ports of the EtherNet/IP connec-
tion 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 multi
cast telegrams. Multicast telegrams that are usually sent from the adapters
(DHR41B) to the scanners (PLC) in EtherNet/IP networks are passed on to all switch
ports.
• IGMP Snooping (e.g. Managed Switches) is not supported.
• SEW-EURODRIVE therefore recommends to connect the DHR41B option in Ether-
Net/IP networks only with network components that support IGMP snooping (e.g.
managed switch) or that have safety mechanisms integrated against excess multi-
cast load (e.g. units from SEW-EURODRIVE). Units that do not have this integrated
function can fail due to high network loads.
TIP
The number of Industrial Ethernet switches connected in line impacts on the telegram
run time. 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
μ
s (at 100 Mbit/s)
• for a telegram length of 1500 bytes by approximately 130
μ
s (at 100 Mbit/s)
This means that the more units a telegram has to pass through, the higher the telegram
runtime is.
Содержание DHR41B
Страница 2: ...SEW EURODRIVE Driving the world ...
Страница 129: ...SEW EURODRIVE Driving the world ...