Duplicate Profinet Io-Device Ip Address; Duplicate Profinet Io-Controller Ip Address - Emerson PACSystems RX3i User Manual

RSTI-EP PROFINET I/O Controller User Manual
GFK-2571R
4.2.1

Duplicate PROFINET IO-Device IP Address

The PROFINET IO-Controller will detect an IP Address conflict between a device that it is
configured to communicate with and another device in two situations:
• First, duplicates are detected when the PROFINET IO-Controller is trying to initially
establish communications with the configured PROFINET IO-Device. During the
connection sequence, the PROFINET IO-Controller queries the network to see whether
any other node has the same IP Address as the configured device.
• Second, duplicates are detected whenever a network device announces its presence5
on the network and the IP Address of that device is identical to that of a PROFINET IO-
Device that the PROFINET Controller is currently communicating with.
In both cases, the PACSystems PROFINET IO-Controller attempts to establish or maintain
the connection and logs a Duplicate IP Address Detected fault for the device. The PROFINET
IO-Controller then periodically queries the network for resolution of the IP Address conflict.
If the IP Address conflict is resolved, the PROFINET IO-Controller logs a Duplicate IP Address
Resolved fault for the device.
4.2.2

Duplicate PROFINET IO-Controller IP Address

The PROFINET IO-Controller detects that a network device has the same IP Address as its
own
• during power-up,
• whenever a new hardware configuration is downloaded from the programmer, and
• during operation whenever a device with a conflicting IP Address announces its
presence
When a duplicate is detected during power-up, following a reset, or following storage of a
new hardware configuration, the PROFINET IO-Controller:
• logs a Duplicate IP Address Detected fault for itself,
• does not connect to any configured PROFINET IO Devices,
• periodically queries the network for resolution of the IP Address conflict.
When a duplicate IP Address is detected after the PROFINET IO-Controller has established
connection to configured IO-Devices, the PROFINET IO-Controller:
• logs a Duplicate IP Address Detected fault for itself,
• maintains all IO-Device connections
5 The PROFINET Controller uses the ARP protocol to detect duplicate IP addresses. Devices that issue a gratuitous ARP to announce their
presence on the network are detected.
6
The PROFINET Controller uses the ARP protocol to detect duplicate IP addresses. Devices that issue a gratuitous ARP to announce their
presence on the network are detected.
PROFINET System Operation
6 on the network.
Section 4
May 2021
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