Layout and connections
vacon • 25
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
4
Figure 15. DLR ring: Network configuration after failure (FAULT_STATE)
The ring recovers after Beacon frames again are received from both of the active ring supervisors
ring ports. Ring recovers back to its original state (Figure 13).
NOTE!
DLR is active only when EtherNet/IP is the selected protocol. DLR is available since V002
fimware for OPTEA and since V009 firmware for OPTE9 board.
DLR Recovery Times
DLR allows setting of the beacon interval and the beacon timeout values, with lower beacon interval
providing faster ring recovery performance. With default values (400 μs interval and 1960 μs
timeout), DLR can reach much faster ring recovery times than e.g. Media Redundancy Protocol.
Typically, these times are around 3 ms for Beacon-based and 4 ms for Announce-based nodes.
When using DLR, we recommend that the watchdog time is set to a value greater than 4 ms. This
will ensure that a properly configured ring network will recover from a network failure within the
watchdog time.
4.5
ACD (Address Conflict Detection)
The OPTEA and OPTE9 option boards implement ACD algorithm (IETF RFC 5227). The
implementation includes requirements from the EtherNet/IP protocol.
The ACD algorithm tries to actively detect if the IP address configured to this device is been used by
another device in the same network. To accomplish this, ACD sends four ARP request packets when
the device's Ethernet interface goes up or when its IP address changes. ACD prevents the use of the
Ethernet interface until the ARP probing finishes. This delays the startup of fieldbus protocols about
one second. During the delay or after it, the ACD passively checks incoming ARP messages for use
of the device's IP address. If another device with the same IP address is detected, the ACD will try
to defend its IP address with a single ARP message. If the other device with the same IP address
also supports ACD, it should stop using the address. If not, the ACD will close the Ethernet
connection and indicate the situation with LEDs. This is done according the "DefendWithPolicyB".
Other policies are not supported. If the fieldbus protocol has been active, a fieldbus fault may be
activated (depends on the fieldbus and drive application configuration).
DLR
NODE
OPTE9-1
DLR
NODE
OPTE9-2
DLR
NODE
OPTE9-3
11859_uk
DLR
NODE
OPTE9-4
ACTIVE RING
SUPERVISOR
Summary of Contents for optea
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