RSTI-EP PROFINET I/O Controller User Manual
Section 4
GFK-2571R
May 2021
PROFINET System Operation
89
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
6
on the network.
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.
Summary of Contents for PACSystems RX3i
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Page 72: ...RSTI EP PROFINET I O Controller User Manual Section 3 GFK 2571R May 2021 Configuration 65 ...
Page 82: ...RSTI EP PROFINET I O Controller User Manual Section 3 GFK 2571R May 2021 Configuration 75 ...