GET_3X: Read %IW Words (3x-Register)

Function description

This function writes values from the %IW register area (3x) of the state RAM to the variable that is connected to the output pin.

Offset is an offset in the %IW register memory (3x).

The function copies as many bytes as the size of the output data type which is connected to the output pin.

and can be configured as additional parameters.

Example

The output of this function reads the 16-bit value of register %IW120 (register 300120), if Offset = 120 and the output is of data type INT.

The value in Offset may be modified at runtime.

If Offset lies outside the configured number of %IW (3x), an error message is generated and ENO is set to 0.

Representation in FBD

Representation:

Representation in LD

Representation:

Representation in IL

Representation:

LD Offset
GET_3X
ST Output

Representation in ST

Representation:

Output := GET_3X (Offset);

Parameter description

Description of input parameters:

Parameter	Data type	Description
Offset	UINT	Offset in the %IW (3x) register memory.

Description of output parameters:

Parameter	Data type	Description
Output	ANY	Output

Runtime error

For a list of all block error codes and values, see Extension/Compatibility.

EN stands for ENable; it is an optional block input. When the EN input is enabled, an ENO output is set automatically.

If EN = 0, the block is not enabled; its internal program is not executed, and ENO is set to 0.

If EN = 1, the block's internal program is run and ENO is set to 1. If an error occurs, ENO is set to 0.

If the EN input is not connected, it is set automatically to 1.

ENO

ENO stands for Error NOtification; this is the output associated with the optional input EN.

If ENO is set to 0 (because EN = 0 or in case of an execution error):

the status of the function block outputs remains the same as it was during the previous scanning cycle that executed correctly;
the output(s) of the function, as well as the procedures, are set to "0".