The LinkedListIsEmpty Function tests whether a LinkedList Data Object contains no entries.
Informal Syntax:
LinkedListIsEmpty( LinkedListID )
Formal Syntax:
LinkedListIsEmpty(
LinkedListID:=Expression )
The LinkedListIsEmpty Function has these parameters.
| Parameter | Type | Description |
|---|---|---|
| LinkedListID | DINT | The identifier of the LinkedList Data Object. |
The function returns a BOOL value as follows:
| Value | Description |
|---|---|
| FALSE | The LinkedList Data Object contains at least 1 elementary data value. |
| TRUE | The LinkedList Data Object is empty. |
A LinkedList Data Object is empty if it contains no entries.
The function reports a runtime error if the LinkedListID parameter does not refer to a valid LinkedList Data Object.
The LinkedListIsEmpty Function is an extension to the IEC 61131-3 standard.
For information about functions to manage LinkedList data objects.
For information about all Data Objects supported by Fernhill SCADA.
To learn how IEC 61131-3 is used in Fernhill SCADA.
For the meaning of terms used in Fernhill SCADA.