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100 Rockwell Automation Publication 1783-UM007I-EN-P - December 2017
Chapter 3 Configure Switch Features
Figure 9 - Time Sync Information
Table 35 - Time Sync Information Fields
Field Description
CIP Sync Time Synchronization Displays whether the Precision Time Protocol is enabled or disabled on the device.
UTC System Time Displays the current system time in units of microseconds.
Grandmaster Clock
Description Displays information to identify the Grandmaster clock, including the configured the clock type.
Identity Displays the unique identifier for the Grandmaster clock. The format depends on the network protocol.
Class Displays a measure of the quality of the Grandmaster clock. Values are defined from 0…255 with 0 as the best clock.
Accuracy Indicates the expected absolute accuracy of the Grandmaster 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 Grandmaster clock. The value is 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
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
Sync Status Displays whether the local clock is synchronized or asynchronized with the Grandmaster clock.
Offset to Master Displays the offset value between the local clock and the master clock.
Identity Displays the unique identifier for the local clock. The format depends on the network protocol.
• The Ethernet protocol encodes the MAC ID into the identifier.
• The DeviceNet and ControlNet protocols encode the Vendor ID and serial number into the identifier.