ReadData
Reads data points from index StartIndex to StartIndex + NumberOfPoints - 1. The first valid index is 1.
Returns 0 on success or a non-zero error code.
Syntax
Definition:
METHOD ReadData : UDINT
VAR_INPUT
DestinationAddress : Pointer To MotionFunctionPoint;
NumberOfPoints : UDINT;
StartIndex : UDINT;
END_VAR
VAR_OUTPUT
NumberOfPointsRead : UDINT;
END_VAR
Inputs
|
Name |
Type |
Description |
|---|---|---|
|
DestinationAddress |
Pointer To MotionFunctionPoint |
Pointer to the destination buffer for the requested data points. |
|
NumberOfPoints |
UDINT |
Number of points to read. |
|
StartIndex |
UDINT |
Index of the first point to read. |
Outputs
|
Name |
Type |
Description |
|---|---|---|
|
NumberOfPointsRead |
UDINT |
The actual number of points read, which can be less than or equal to the specified NumberOfPoints. |
Return value
UDINT
Possible error codes
For this function block, the following values, among others, are possible for the ErrorId output:
Error(Hex) | Error(Dec) | Error type | Description |
|---|---|---|---|
0x8120 | 33056 | Environment | Invalid configuration for object (e.g., in TwinCAT 3 Engineering (XAE)). The static configuration of the object (parameters, init values, linked symbols) is incomplete or invalid, so the object cannot reach the target state. |
0x8198 | 33176 | Parameter | Invalid index. The used index does not exist or is invalid. |
An overview of all NC error codes can be found here: