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PROFINET IO - general info
vacon • 7
During the delay or after it, the ACD passively checks incoming ARP messages for use of the de-
vice'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 an Alarm. This is done according the "DefendWithPolicyB".
Acknowledging of the Alarm is not possible if the problem is active. ACD opens Ethernet connection
if the other device with the same IP address disappears from the network. Alarm can be acknowl-
edged after this. 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).
If IP settings are set via Profinet IO DCP messages, then ACD will be disabled until drive is restarted.
This is done because some PLCs expect to be able to connect to drive immediately after setting IP
settings. ACD causes a few second delay before that is possible. After connecting failure, the PLC
usually waits twenty seconds or more before trying again. This then means that getting successful
connection takes more than twenty seconds and will cause unnecessary delay for process control.
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
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