| Function Name |
MAKE_DATE_AND_TIME_FROM_OPC |
|---|---|
|
Description |
Provides a date and time output that is made up from the input string (which defines a time in the OPC time format). Typically, this input is provided by a value in the database, for example, the TrendOffset tag of a point. |
|
Arguments |
Input 1 {STRING - OPC Time Format} For more information on the data types for the inputs and outputs, see Data Type Hierarchy. |
|
Returns |
Output {DATE_AND_TIME} |
Example:
Function Block Diagram - MAKE_DATE_AND_TIME_FROM_OPC:
The MAKE_DATE_AND_TIME_FROM_OPC function provides a date and time value. The output is calculated by using the OPC time provided by the string input. In the example shown above, the V1 input is a tag (the tag represents the TrendOffset configuration property of a point. The TrendOffset is a time value defined in the OPC time format, in this case, M-10M). The MAKE_DATE_AND_TIME_FROM_OPC function uses the OPC time defined in the input string and the current time (on the server) to calculate its output.
So, at 09:11:00.000 on April 3rd 2006, the MAKE_DATE_AND_TIME_FROM_OPC function outputs 2006-04-03-09:01:00.000 (the current time - ten minutes from the start of the current minute as defined by the V1 input). Not that the date format used here is YYYY, MM, DD.
ST Program - MAKE_DATE_AND_TIME_FROM_OPC:
The syntax for a MAKE_DATE_AND_TIME_FROM_OPC function in an ST Program is:
- Output := MAKE_DATE_AND_TIME_FROM_OPC (Input 1);
Where Output and Input 1 are defined as variables earlier in the ST program. The Input 1 variable represents a String that contains a time value in the OPC time format.
Further Information
OPC Time Format: see Using OPC Time Formats in the ClearSCADA Guide to Core Configuration.