ADS/ADX Site Director with network engines - Metasys - LIT-1201645 - MS-ADSxxx-x - MS-ADXxxx-x - Server - ADS Server - ADX Server - 12.0

ADS/ADX Commissioning Guide

Product name
ADS Server
ADX Server
Document type
Commissioning Guide
Document number
LIT-1201645
Version
12.0
Revision date
2022-09-22
Product status
Active

About this task

On a site with an ADS/ADX Site Director and network engines, the following time synchronization steps occur:

Procedure

  1. ADS/ADX Site Director comes online.
  2. Network engines come online and check in with the Site Director.
  3. Every 15 seconds, the network engines check for ADS/ADX online/offline conditions. If the ADS/ADX is offline, the network engines send an IAmLive message to the ADS/ADX every 20 seconds.
  4. When the ADS/ADX receives the IAmLive message, it attempts to validate the security credentials of the network engines. If the time in the network engines is different than the time in the ADS/ADX by 5 or more minutes (also taking into account the time zone of each network engine), the engine security credentials are invalidated.
  5. Network engines come online and check in with the Site Director.
  6. Every 15 seconds, the network engines check for ADS/ADX online/offline conditions. If the ADS/ADX is offline, the network engines send an IAmLive message to the ADS/ADX every 20 seconds.
  7. When the network engine receives back an invalidated credential, the network engines request the current time from the ADS/ADX and update the engine time to match (also taking into account the time zone of each network engine).
    Note: Time between an ADS/ADX and network engines synchronizes only if the time differs between the ADS/ADX and network engines by 5 or more minutes. In the worst case scenario, one network engine could be 4 minutes and 59 seconds ahead of the ADS/ADX , and another network engine could be 4 minutes and 59 seconds behind the ADS/ADX .
  8. After time is synchronized and the ADS/ADX is online, the network engines send IAmLive messages to the ADS/ADX every 5 minutes (instead of every 20 seconds).
    Note: Time synchronization is affected if you change the network engine's Site Director from an ADS/ADX in one time zone to an ADS/ADX in a different time zone. If you make this change online, as an interim step, promote the network engine to be its own Site Director, wait several minutes, then assign to the network engine the ADS/ADX Site Director in the new time zone. This interim step ensures proper time synchronization.