Rockwell Automation 1734-AENTR EtherNet/IP Network Configuration User Manual - Manual (Page 124)

124 Rockwell Automation Publication ENET-UM001L-EN-P - March 2014
Chapter 10 Troubleshoot an EtherNet/IP Communication Module with Diagnostic Web Pages
124 Rockwell Automation Publication ENET-UM001L-EN-P - March 2014
Chapter 10 Troubleshoot an EtherNet/IP Communication Module with Diagnostic Web Pages
1. Review the values in the Ethernet Link table.
2. Review the System Resource Utilization table to evaluate your CPU
utilization.
If And you Then
Speed is 100 or
1000
Mbps Do not want to change your port speed No action is required.
Important: 100 Mbps is the default port speed.
Want to reduce your port speed to 10 Mbps You must manually configure your module and reset your module.
10 Mbps Want to increase your port speed to 100 Mbps Reset your module
Do not want to change your port speed No action is required.
Duplex is Full Are sending large amounts of data No action is required.
Important: Full Duplex is the default port setting.
Full-duplex ports eliminate collisions because each device has separate channels for the
transmission and receipt of large amounts of data.
Half Are not sending large amounts of data No action is required.
Important: Delays due to collisions or switch traffic are usually negligible, but can become a
problem if you need to send a lot of data.
Are sending large amounts of data Change your module’s Duplex setting to Full.
Autonegotiate
Status is Speed
and/or
Duplex Are using a fiber converter Change your module’s Autonegotiate status to None.
Important: Fiber links do not support autonegotiation.
Are not using a fiber converter No action is required.
Important: Speed and/or Duplex is the default setting.
Autonegotation enables devices to select the best way to communicate without you having to
do any configuring. All devices with an Ethernet speed rating of 100 Mbps are required to
support autonegotiation.
None Are not using a fiber converter Change your module’s Autonegotiate status to Speed and/or Duplex.
If the CPU
utilization rate is Then
0...80% No action is required.
Important: This is the optimal rate.
Greater than 80% • Take steps to reduce your CPU utilization. See Internet Group Multicast Protocol on
page 144 .
• Adjust your connection’s requested packet interval (RPI).
• Reduce the number of devices connected to your module.
Important: Your EtherNet/IP communication module can function at 100% CPU capacity,
but at or near this rate, you run the risk of CPU saturation and performance problems.