Rockwell Automation 1734-AENTR EtherNet/IP Network Configuration User Manual - Manual (Page 125)

Rockwell Automation Publication ENET-UM001L-EN-P - March 2014 125
Troubleshoot an EtherNet/IP Communication Module with Diagnostic Web Pages Chapter 10
Rockwell Automation Publication ENET-UM001L-EN-P - March 2014 125
Troubleshoot an EtherNet/IP Communication Module with Diagnostic Web Pages Chapter 10
3. Review the Missed field in the I/O Packet Counter Statistics table.
This field shows how many I/O packets have been missed. Your EtherNet/
IP communication module may lose I/O packets due to these conditions:
• Packets are produced faster than the connection’s requested packet
interval (RPI). This happens for change-of-state connections or a new
consumer requesting a faster RPI than the first consumer.
• A packet is received out of sequence.
4. If more than zero packets have been recorded as lost, review the Inhibited
and Rejected fields in the I/O Packet Counter Statistics table.
If Then
There are more than zero inhibited
I/O packets
Reconfigure your module to produce packets no more quickly than the connection’s RPI.
There are more than zero rejected
I/O packets
View the Message Connections diagnostic web page to confirm what, if any, connections are closed. For more information, see Message
Connections on page 126 .
Important: If more than four I/O packets have been rejected, your module has probably lost its connection.
There are possibly duplicate module IP addresses. Many EtherNet/IP communication modules can detect duplicate IP addresses.
A packet has possibly been received out of sequence and rejected because the previous packet was inhibited.
Reconfigure your module to produce packets no more quickly than the connection’s RPI.