Overriding [OPCLX]CacheRead

You can override the value in [OPCLX]CacheRead for a particular tag by suffixing the tag address with:

• The delimeter "!"

• The letter C or D, as follows:

  <Tag Name>!C - The tag value returned is the cache value at the time of the read.

  <Tag Name>!D - A refresh of the tag value is forced before it is returned.

Examples:

• Tag1!D - Forces a refresh of Tag1 before the value is returned.

• Tag2!C - The last known cache value of Tag2 is returned.

When the tag qualifiers C and D are used with other OPCLX qualifiers (see Time Stamp and Quality Tags Configuration), they must appear last.

For example, with "Tag3!Q!C", Tag3 is associated with a quality tag and the last known value of Tag3 is returned