Introduction

Use the Network Time Service Diagnostic page to display dynamically generated data describing the operation of the simple network time protocol – either SNTP or NTPv4 (depending on your CPU firmware) – service that you configured in the network time server page in Control Expert.

NOTE: Before you can open the diagnostics page, make the connection between the DTM for the target communication module and the CPU.

Refer to the System Time Stamping User Guide for detailed diagnostic information.

Open the Page

Access the NTP Diagnostic information:

Step

Action

1

In the DTM Browser, find the name that is assigned to the CPU.

2

Right-click the CPU DTM, and select Device menu > Diagnosis .

3

In the left pane of the Diagnosis window, select the CPU node.

4

Select the NTP Diagnostic tab to open that page.

Click the Reset Counter button to reset the counting statistics on this page to 0.

SNTP Service Diagnostic Parameters

This table describes the SNTP time synchronization service parameters:

Parameter

Description

Refresh Every 500ms

Check this box to dynamically update the page every 500ms. The number of times this page has been refreshed appears immediately to the right.

Network Time Service

Monitor the operational status of the service in the module:

  • green: operational

  • orange: disabled

Network Time Server Status

Monitor the communication status of the NTP server:

  • green: The NTP server is reachable.

  • red: The NTP server is not reachable.

Last Update

Elapsed time, in seconds, since the most recent NTP server update.

Current Date

System date

Current Time

The system time is presented in the hh:mm:ss format.

DST Status

Set the status of the automatic daylight savings service:

  • ON: The automatic adjustment of daylight savings is enabled. The current date and time reflect the daylight savings time adjustment.

  • OFF: The automatic adjustment of daylight savings is disabled. (The current date and time may not reflect the daylight savings time adjustment.)

Quality

This correction (in seconds) applies to the local counter at every NTP server update. Numbers greater than 0 indicate increasingly excessive traffic condition or an NTP server overload.

Requests

This value represents the total number of client requests sent to the NTP server.

Responses

This value represents the total number of server responses sent from the NTP server.

Errors

This value represents the total number of unanswered NTP requests.

Last Error

This value indicates the last detected error code received from the NTP client:

  • 0: good NTP configuration

  • 1: late NTP server response (can be caused by excessive network traffic or server overload)

  • 2: NTP not configured

  • 3: invalid NTP parameter setting

  • 4: NTP component disabled

  • 5: NTP server is not synchronized (NTP server needs to be synchronized so that the NTP accesses behave as defined in the client NTP settings)

  • 7: unrecoverable NTP transmission

  • 9: invalid NTP server IP address

  • 15: invalid syntax in the custom time zone rules file

Primary / Secondary NTP Server IP

The IP addresses correspond to the primary and secondary NTP servers.

NOTE: A green LED to the right of the primary or secondary NTP server IP address indicates the active server.

Auto Adjust Clock for Daylight Savings

Configure the daylight savings adjustment service:

  • enabled

  • disabled

DST Start / DST End

Specify the day on which daylight savings time begins and ends:

Month

Set the month in which daylight savings time starts or ends.

Day of Week

Set the day of the week on which daylight savings time starts or ends.

Week#

Set the occurrence of the specified day within the specified month.

Time Zone

Select the time zone plus or minus Universal Time, Coordinated (UTC)

Offset

Configure the time (in minutes) to be combined with the time zone selection (above) to produce the system time.

Polling Period

Set the frequency with which the NTP client requests an updated time from the NTP server

NTPv4 Service Diagnostic Parameters

This table describes the NTP time synchronization service parameters:

Parameter

Description

Refresh Every 500ms

Check this box to dynamically update the page every 500ms.

The number of times this page has been refreshed appears immediately to the right.

NTP V4 Service

Service state

The operational status of the service in the module:

  • green: operational

  • orange: disabled

Sync

The status of the module:

  • green: synchronized

  • orange: not synchronized

Accuracy

NTP clients only: The estimated difference between local (client) time and server time.

Mode

  • Server / Client

  • Server only

System clock

Date

Local date.

Time

Local time.

Time Zone

The local time zone, by reference to coordinated universal time (UTC).

DST

The status of the automatic daylight savings service:

  • ON: The automatic adjustment of daylight savings is enabled. The current date and time reflect the daylight savings time adjustment.

  • OFF: The automatic adjustment of daylight savings is disabled. (The current date and time may not reflect the daylight savings time adjustment.)

<NTP System Status>

UTC-Date

The date at the UTC time source.

UTC-Time

The time at the UTC time source.

Stratum

The relative position in the hierarchy between this client and the original time source (stratum 1) reference. If the mode is:

  • Server/Client: the value equals the system peer stratum value + 1.

  • Server only (or orphan): a user-defined value.

Root delay

NTP clients only: The round trip request delay, in milliseconds, from a client to a stratum 1 server.

Root dispersion

NTP clients only: The additional delay contributed by other factors.

Polling time

NTP clients only: Polling interval, in seconds.

RefID

IPv4 address of the time source.

<NTP Peers Statuses>
(NTP clients only)

NTP client CPU can be configured with up to 8 time source peers, each a potential server to the CPU NTP client.

IP

Peer IPv4 address of the peer.

RefID

IP address of the time source used by the peer.

Select

Indicates the peer used as the time source (Current) and other viable peer time sources (Candidate).

Reach count

Percentage of NTP messages successfully sent to and received from the peer.

Stratum

The relative position in the hierarchy between this client and the original time source (stratum 1) reference.

Poll

Polling interval, in seconds.

Delay

Time to send request / receive response.

Offset

The value to subtracted from received time value to obtain time value to be applied.

Jitter

Variability in delay.