Rockwell Automation 1426 PowerMonitor 5000 Unit - Manual (Page 175)

Rockwell Automation Publication 1426-UM001F-EN-P - November 2013 175
Other Functions Chapter 8
Network Time
Synchronization The PowerMonitor 5000 unit can be set up to synchronize its system clock by
using Network Time Synchronization. Network time synchronization clock
sources provide better precision and improved coordination between multiple
meters. Two different methods of time synchronization are supported, simple
network time protocol (SNTP) or precision time protocol (PTP).
Applications
This applies to all models.
Operation
With SNTP selected as the time sync source, the power monitor updates its time
from a simple network time protocol server or an anycast group of SNTP servers,
depending on set-up parameter values. This requires an available SNTP time
server.
When PTP is selected, the power monitor updates its time from a precision time
protocol master clock. A PTP master clock source must be available. PTP is the
more accurate of the two network time synchronization options.
IMPORTANT Quality of Service (QoS) is a general term that is applied to mechanisms used to
treat traffic streams with different relative priorities or other delivery
characteristics. Standard QoS mechanisms include IEEE 802.1D/Q (Ethernet
frame priority) and Differentiated Services (DiffServ) in the TCP/IP protocol
suite. The QoS Object provides a means to configure certain QoS-related
behaviors in EtherNet/IP devices. QoS by default is enabled. We suggest that
you do not change the default values.