ReadValue Subroutine

Reads the value of the specified block.

Syntax

ReadValue[DataPoint], [intErrorMode]

Properties

The ReadValue subroutine syntax has these parts:

Part

Description

DataPoint

String. (Optional). The database block that you want to read. If no block is specified, the data source associated with the selected object is read.

intErrorMode

Integer. (Optional). The error mode.
0 (default) – Allows the subroutines to provide the error messages. Errors are displayed in the form of a message box. If no entry is made for the intErrorMode parameter, the default is used.

1 – Allows the user to handle the error messages. Errors in the subroutines are passed back to the calling routine for handling.

2 – Writes errors to all destinations. No error messages display. Instead, the errors are written to all iFIX destinations, including the Alarm History window destinations using SendOperatorMessage. To view your enabled alarm destinations, open the System Configuration Utility (SCU.EXE) and on the Configure menu, click Alarm. The Alarm Configuration dialog box appears where you can access this information.

Return Value

ReadValue returns the value of the specified block.

 

Example