%chg

The %udd macro is used in the Event Handler to read the value of an UDD (User Defined Data variable). Text formatting parameters can be added at the end.
From AMC 11.02 also alphanumeric labeling can be used. Alphanumeric labeling will be cleared after reset.

Syntax

%chg(ON_txt,OFF_txt)

Returns "ON_txt" when the event goes ON, "OFF_txt" when the event goes OFF

Examples

LOG "Door %1.dir is %chg(OPEN ,CLOSED)"

Result in log when event goes ON: - "Door 123 is OPEN"
Result in log when event goes OFF: - "Door 123 is CLOSED"

See also

Applications were UDD are used:

• CCTV control by relays (RCO) when using Call Request

Related articles:

• Built-in command to write to UDD: WUDD
• Data message to write to UDD: $WUDD
• Variable for text string: tmp

Back to Event_Handler#List_of_macros.