User Manual User guide

Rockwell Automation Publication 1783-UM004E-EN-P - June 2014 147
Manage the Switch via the Device Manager Web Interface Chapter 4
Delay Request Interval The time interval recommended to connected devices to send delay request messages when the switch port is in the
master state:
•-1 means half second
•0 means 1 second
•1 means 2 seconds
•2 means 4 seconds
•3 means 8 seconds
•4 means 16 seconds
•5 means 32 seconds
•6 means 64 seconds
The default is 5 (32 seconds).
Announce Timeout The number of announce intervals that must pass without receipt of an announce message from the Grandmaster clock
before the switch selects a new Grandmaster clock. The number can be from 2…10. The default is 3.
Announce Interval The time interval for sending announce messages:
•0 means 1 second
•1 means 2 seconds
•2 means 4 seconds
•3 means 8 seconds
•4 means 16 seconds
The default is 1 (2 seconds).
Sync Interval The time interval for sending synchronization messages:
•-1 means half second
•0 means 1 second
•1 means 2 seconds
The default is 0 (1 second).
Sync Fault Limit The maximum clock offset before PTP attempts to reacquire synchronization. The value can be from 50…500,000,000
nanoseconds. The default is 50,000 nanoseconds.
We recommend against setting the sync limit below the default (50,000 nanoseconds).
Use values below 50,000 nanoseconds only in networks with a very-high-precision Grandmaster clock. These networks
have a critical need to keep very sensitive devices synchronized.
Table 16 - PTP Fields (continued)
Field Description