Tag status handler – National Instruments BridgeVIEW User Manual
Page 364
Appendix A
HMI Function Reference
A-44
© National Instruments Corporation
Tag Status Handler
Use the Tag Status Handler VI to obtain a description of the tag status, by breaking it down
into warning or error conditions coming from BridgeVIEW as well as the device server. It
also identifies where the error or warning occurred. The information for looking up status is
derived from the inputs: tag status, source, server error codes, server error descriptions,
and from an internal error description lookup that describes all the status values returned from
the Engine or a Server in BridgeVIEW.
source is a string you can use to describe the VI that is the source of
warning or error indicated by tag status. This is returned as a part of the
message string if there is an error.
tag status can be broken down into status information from BridgeVIEW
(Engine or Server); and status information from a server or a user error.
type of dialog (OK msg:1) determines what type of dialog box is
displayed, if any. Regardless of its value, the VI returns error information
and a message describing the error. According to the value, the VI does one
of the following:
•
Displays no dialog box. This is useful if you want to have
programmatic control over how an error is handled.
•
Displays a dialog box with a single OK button. After the user
responds, the VI returns control to the main VI. This is the default
setting.
•
Displays a dialog box with buttons allowing the user to continue or
stop. If the user cancels, the VI calls the Stop function to halt
execution.
server error codes is an array of numeric error codes defined for your
device server(s).
server error descriptions is an array of descriptions of server error codes.
If an incoming error matches one in server error codes, the VI uses the
corresponding description from server error descriptions in the message.
message describes the tag status by breaking it down into the error or
warning returned by BridgeVIEW as well as the error or warning, if any,