Applies To:
  • CitectSCADA 5.xx, 6.xx, 7.00
  • CitectHMI 5.xx, 6.xx, 7.00

Remote IO units need to have Cached=TRUE in the CitectSCADA Project Editor so that values read whilst dialled-up remain after disconnecting. This setting means that the cached tag values will get written to disk after disconnecting and at shutdown. At startup, if there is a cache file available, it will be loaded and the values will be displayed before any dialling occurs. This functionality is not always desirable.  

There is a way to not have the cache for remote IO devices persisted to disk.  As of v7.00, you can set [Dial]PersistCache to 0 and the cache for remote IO devices will not be persisted (written) to disk.  

scheduled i/o dialup