Rockwell Automation Publication 1783-UM007G-EN-P - February 2017 211
Configure Switch Features Chapter 7
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 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
Table 40 - Time Sync Information Fields (continued)
Field Description
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