In addition to the usual data fields that you would expect to find on a ClearSCADA Point object, a Totalflow Digital Point object also has the following data fields, which are listed in the ClearSCADA Database Schema (see Digital Point Schema View). The name in bold at the start of each entry is also the OPC tag name.
- CurrentValueAsBoolArray—This tag provides a convenient way to access the values of the individual bits values in the value without script. You can use an expression with array referencing to get the value of a single bit. For example, to access the least significant bit, write
PointName.CurrentValueAsBoolArray[0]in an expression. To get the next least significant bit, writePointName.CurrentValueAsBoolArray[1]and so on. - CurrentValueAsByteArray—This tag provides a convenient way to access the values of the individual byte values in the value without script. You can use an expression with array referencing to get the value of a single byte. For example, to access the least significant byte, write
PointName.CurrentValueAsByteArray[0]in an expression. To get the next least significant bit, writePointName.CurrentValueAsByteArray[1]and so on. - LastError—This field contains a string which describes the last error on the point. For example, an error for a write request to a read only value.
- LastErrorTime—This field contains the timestamp for the entry in the LastError field. The driver generates the timestamp.
Further Information