254 Rockwell Automation Publication 5069-UM002A-EN-P - January 2019
Chapter 11 Troubleshoot the Controller
Table 25 - Time Sync Parameters
Grandmaster Clock
Description Displays information about the Grandmaster clock. The vendor of the Grandmaster device
controls this information. This information is specified:
• User Name
• User Location
• Protocol Address
• Physical Address
• Clock Type
• Manufacturer Name
• Model
• Serial Number
• Hardware Revision
• Firmware Revision
• Software Version
• Profile Identity
• Physical Protocol
• Network Protocol
• Port Number
Use the vertical scroll bar to view the data.
Identity Displays the unique identifier for the Grandmaster clock. The format depends on the
network protocol. Ethernet network encodes the MAC address into the identifier.
Class Displays a measure of the quality of the Grandmaster clock. Values are defined from
0…255 with zero as the best clock.
Accuracy Indicates the expected absolute accuracy of the Grandmaster clock relative to the PTP
epoch. The accuracy is specified as a graduated scale that starts at 25 nsec and ends at
greater than 10 seconds or unknown. The lower the accuracy value, the better the clock.
Variance Displays the measure of inherent stability properties of the Grandmaster clock. The value
is represented in offset scaled log units. The lower the variance, the better the clock.
Source Displays the time source of the Grandmaster clock. The available values are:
• Atomic Clock
• GPS
• Radio
• PTP
• NTP
• HAND set
• Other
• Oscillator
Priority 1 / Priority 2 Displays the relative priority of the Grandmaster clock to other clocks in the system. The
priority values range from 0…255. The highest priority is zero. The default value for both
settings is 128.
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