How to configure the Windows Time Service to use an internal clock

NOTICE

POTENTIAL FOR DATA LOSS.
The steps detailed in the resolution of this article may result in a loss of critical data if not performed properly. Before beginning these steps, make sure all important data is backed up in the event of data loss. If you are unsure, please contact Product Support Services prior to attempting the procedure below.

Issue

Time synchronisation is often an issue on large BMS installations. A central time signal is normally required to make sure all controllers, terminals or workstations have the correct time. If there is no internet connection available then the time has to be synchronised from a central source.

Product Line

TAC Vista, Andover Continuum, Satchwell MicroNet, Satchwell Sigma, SmartStruxure Solution

Environment

Sigma

Continuum

Vista

SmartStruxure

Windows XP

Windows 7

Server 2003

Server 2008 R2

Cause

No internet connection available to synchronise the system time.

Resolution

Important The methods below contain steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs.

If using Windows XP, please use the following link - http://support.microsoft.com/kb/314054

If using Server or Windows 7 OS, please use the following link - http://support.microsoft.com/kb/816042

This has been tested for Time updates to an AS by simply using the PC IP address as the primary NTP Time Server. If the firewall is turned on you also need to make sure UDP 123 is open.

Please note that Windows will add a dispersion to the time that may cause issues with time synchronization, please see Lessons Learned article 17955 for details.