An OPC relative time
Format
{{ OPC { 'TimeValue' | ? | ( TimeExpr ) } }}
Remarks
Specifies an OPC relative time.
The Time value can be one of the following:
- A string literal defining the OPC relative time.
- A parameter marker.
- A string expression enclosed in parentheses.
The resulting string is interpreted as an OPC Relative time, in the format: Keyword [ [ { + | - } ] QuantityKeyword ]*.
Where Keyword is taken from the following table and Quantity is a numeric value.
| Keyword | Description |
|---|---|
| NOW | The current time |
| SECOND | Seconds |
| MINUTE | Minutes |
| HOUR | Hours |
| DAY | Days |
| WEEK | Weeks |
| MONTH | Months |
| YEAR | Years |
Keywords can be abbreviated.
Example:
{OPC 'NOW'}
{OPC 'HOUR + 5 MINUTES'}
{OPC (? || ' + 1H - 5M'}