Allen-Bradley armorstratix 5700, User Manual, Page: 103 / 458

Rockwell Automation Publication 1783-UM007I-EN-P - December 2017 103
Configure Switch Features Chapter 3
Figure 10 - Example Device Level Ring Topology
A DLR topology includes the following nodes.
IMPORTANT Stratix 5700 and ArmorStratix 5700 switches support only one ring per switch.
Stratix 5400 switches support as many as three rings per switch. The rings can share the same VLAN, or each ring can
be on its own VLAN.
Com
IN2
Ref
IN1
Alarm
IN1 IN2 OUT
DC+
Pwr A
Express
Setup
C
o nsole
DC-
DC+
Pwr B
Esc Sel
1783-ETAP
1783-ETAP
1783-ETAP
Stratix 5700 Switch
1756-EN2TR
1756 I/O Modules
1734-AENTR
1734 I/O Modules
1738-AENTR
1738 I/O Modules
1769-AENTR
1769 I/O Modules
To the Rest of the Network
PowerFlex® 525 Drive
Node Description
Supervisor node A DLR network requires at least one node to be configured as ring supervisor.
IMPORTANT: By default, the supervisor function is disabled on supervisor-capable devices, so they are ready to participate in a linear network or
as a ring node on a DLR network.
In a DLR network, you must configure at least one of the supervisor-capable devices as the ring supervisor before physically connecting the ring. If
you do not, the DLR network does not work.
The ring supervisor provides these main functions:
• Manages traffic on the DLR network
• Collects diagnostic information for the network
We recommend that you do the following:
• Configure at least one back-up supervisor.
• Configure the desired active ring supervisor with a numerically higher precedence value as compared to the back-up supervisors.
• Track the supervisor-precedence values for all supervisor-enabled nodes in the DLR network.
Ring node A ring node is any node that operates on the network to process data that is transmitted over the network. A ring node can also pass on the data
to the next node on the network. When a fault occurs on the DLR network, the ring nodes reconfigure themselves and relearn the network
topology. Additionally, ring nodes can report fault locations to the active ring supervisor.