4
vacon • 24
Layout and connections
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
•
Only the following packets are processed from the blocked port:
•
Beacon frames from self and other supervisors
•
Link_Status/Neighbor_Status frames
•
Neighbor_Check request or response and Sign_On frames
Figure 13. DLR ring: Network configuration when ring is closed (NORMAL_STATE)
If a network error occurs to DLR capable nodes, Link_Status frames are sent by nodes to inform the
ring supervisor immediately which port(s) have a failure (Figure 14).
Figure 14. DLR ring: Failure in network
A Link_Status frame triggers an error response in active ring supervisor, which unblocks traffic on
its previously blocked port (Figure 15). In case of an uncommon failure (for example, if cable breaks
between two non-DLR capable devices), the error is noticed from Beacon timeout value, and not
from Link_Status frames. Therefore, a recovery in a network with non-DLR capable devices can take
longer.
DLR
NODE
OPTE9-1
DLR
NODE
OPTE9-2
DLR
NODE
OPTE9-3
11857_uk
DLR
NODE
OPTE9-4
Beacon
Announce
Beacon
Announce
RING
SUPERVISOR
DLR
NODE
OPTE9-1
DLR
NODE
OPTE9-2
DLR
NODE
OPTE9-3
11858_uk
DLR
NODE
OPTE9-4
ACTIVE RING
SUPERVISOR
Link Status
Link Status
Summary of Contents for optea
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