Allen-Bradley Logix5000 User Manual

Rockwell Automation Publication ENET-UM004B-EN-P - November 2015 61
Module Diagnostics Chapter 6
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.
Local Clock
Synchronization Status Displays whether the local clock is synchronized or not synchronized with the
Grandmaster reference clock. A clock is synchronized if it has one port in the slave
state and is receiving updates from the time master.
Offset to Master Displays the amount of deviation between the local clock and the Grandmaster clock
in nanoseconds.
Backplane State Displays the current state of the backplane. The available values are: Initializing,
Faulty, Disabled, Listening, PreMaster, Master, Passive, Uncalibration, Slave, or None.
Ethernet State Displays the state of the Ethernet port. The available values are: Initializing, Faulty,
Disabled, Listening, PreMaster, Master, Passive, Uncalibration, Slave, or None.
Identity Displays the unique identifier for the local clock. The format depends on the network
protocol. Ethernet network encodes the MAC address into the identifier.
Class Displays a measure of quality of the local clock. Values are defined from 0…255, with
zero as the best clock.
Accuracy Indicates the expected absolute accuracy of the local 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 local 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 local clock. The available values are:
• Atomic Clock
• GPS
• Terrestrial Radio
• PTP
• NTP
• HAND set
• Other
• Oscillator
Table 5 - Time Sync Parameters

Allen-Bradley Logix5000 Specifications

General

Brand	Allen-Bradley
Model	Logix5000
Category	Controller
Language	English