Rockwell Automation 1783-EMS08T Stratix 6000 Ethernet Managed Switch User Manual - Manual (Page 47)

Rockwell Automation Publication 1783-UM001D-EN-P - January 2013 47
Diagnostics Chapter 3
The bar turns red when the bandwidth is out of range. The Alarm Setup tab also
displays these items:
• Refresh—Used to refresh your screen with the latest information, the
screen automatically refreshes at the rate configured under Basic
Configuration and Refresh Rate.
• Save Traffic Reference—Used as a benchmark for the system network.
Click this button when the network is running as it should in production.
The switch calculates the difference between the reference point and the
current levels of traffic for each port. If it varies to an alarm state, it sends
an input to the switch’s controller indicating the port number. See
Appendix D for the complete I/O table for the 1783-EMS switch.
• Bandwidth Alarm—Disabled by default, when enabled calculates the
difference between the reference point of the network and the current rate
of traffic. If a variation exceeding the allowed traffic difference occurs, it
sends an input to the switch’s controller indicating the port number where
the bandwidth shortage is occurring.
• Scaling Factor—Most applications have such a small amount of traffic that
the bandwidth is only a fraction of a percent. The scaling factor provides a
more visual representation of the traffic on each port. See the detailed
information link on the Alarm Setup page for more information on how
the bandwidth is calculated.
• Time Factor—The length of time packets are counted to determine the
bandwidth percentage for each port. See the detailed information link on
the Alarm Setup page for more information on how the bandwidth is
calculated.
• Allowed Traffic Difference—The percentage that the current traffic level
can vary in either direction, from the stored reference value, before an
input is sent to the switch’s controller.