Rockwell Automation 1783-Mxxx Stratix 8000 and 8300 Ethernet Managed Switches User Manual - Manual (Page 167)

Rockwell Automation Publication 1783-UM003I-EN-P - March 2014 167
Manage the Switch via the Studio 5000 Environment Chapter 5
Source Displays the clock time source:
• Atomic Clock
• GPS
• Terrestrial Radio
• CIP Time Synchronization
• NTP
• HAND Set
• Other
• Internal Oscillator
Priority 1
Priority 2 Displays the relative priority of the Grandmaster clock to other clocks in the system. The value is between 0…255. The highest priority is
0.
Local Clock Displays properties for the local clock.
Sync Status Displays whether the local clock is synchronized or asynchronized with the Grandmaster clock.
Identity Displays the unique identifier for the local clock. The format depends on the network protocol.
• The Ethernet protocol encodes the MAC address into the identifier.
• The DeviceNet and ControlNet protocols encode the Vendor ID and serial number into the identifier.
Class Displays a measure of the quality of the local clock. Values are defined from 0…255 with 0 as the best clock.
Accuracy Indicates the expected absolute accuracy of the local clock relative to CIP Sync time synchronization epoch (31 December, 1969
23:59:51.99918 UTC). The accuracy is specified as a graduated scale starting at 25 ns and ending at greater than 10 seconds or unknown.
For example, a GPS time source has an accuracy of approximately 250 ns. A hand-set clock typically has an accuracy less than 10 seconds.
The lower the accuracy value, the better the clock.
Variance Displays the measure of inherent stability properties of the local clock. The value is represented in offset scaled log units. The lower the
variance, the better the clock.
Source Displays the clock time source:
• Atomic Clock
• GPS
• Terrestrial Radio
• CIP Time Synchronization
• NTP
• HAND Set
• Other
• Internal Oscillator
Field Description