OPC Missing data change -

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i'm registering group of variablse opc da server. if modifies items on server (example: disable 1 item , enable after minutes), cannot receive update when tag newly enabled. tested on kepware server doing this:

  1. define tag "const variable"
  2. connect server , register tag
  3. change function "random generation" (the server not disconnect client)
  4. the client not receive value but
  5. disconnect client
  6. reconnect client -> obtain random values

is there way avoid behaviour? not accademic question: in real life make maintenance part of plant without closing server: when puts full plant online, client not receiving changes.

i suppose type of changes results in new opc handle , if i'm registred old one, never receive value change. there common way workaround this? have monitor event? had issue?

thanks.


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