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For every OPC Item that you connect the OPC Time Monitor to in one of your OPC Servers, the OPC Time Monitor will calculate and expose a set of tags upstream to any OPC client that is interested. The items exposed are grouped into a hierarchy that your client application can browse using OPC Item browsing, so you do not have to remember the different pieces of information that are available.
- Basic Tags - summary and control tags - the first ones seen for any given OPC item - see below
- Condition Summary Tags (Supplied separately for “In-Condition”, “Out-of-Condition”, and “Stable” states
- Condition Aggregate Tags (Supplied separately for “In-Condition”, “Out-of-Condition”, and “Stable” states
Basic Tags
These tags appear when you browse the OPC Time Monitor and first select an Item as shown at the right. These 5 tags provide basic information about the current state of the tag relative to the compliance conditions you have configured and provide a tag for resetting the current aggregates.
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Name
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Access Rights
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Canonical (Default) Data Type
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Description
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Readable
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Writeable
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$CurrentValue
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Yes
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No
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VT_EMPTY *
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Passed-through current value of the measured (source) item.
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$InCondition
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Yes
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No
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VT_BOOL
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True of the configured “conditions” for this OPC item in the OPC Time Monitor have been met.
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$OutOfCondition
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Yes
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No
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VT_BOOL
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True of the configured “conditions” for this OPC item in the OPC Time Monitor have NOT been met. Value should typically be the opposite of $InCondition.
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$Reset
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Yes
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Yes
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VT_BOOL
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Writing True value into this item resets the aggregates under this level and below. Reading this item always returns False in this version.
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$Stable
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Yes
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Yes
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VT_BOOL
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True of the configured stability condition for this OPC item in the OPC Time Monitor has been met, false otherwise.
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