Description

Function description

This function block copies the value entered at SRC to the DEST parameter which is interpreted as a table.

and can be configured as additional parameters.

Available functions

The following blocks are available:

R2T_INT
R2T_DINT
R2T_UINT
R2T_UDINT
R2T_REAL

Representation in FBD

Representation:

Representation in LD

Representation:

Representation in IL

Representation:

CAL R2T_Instance (NOINC:=FreezesPointerValue,
    R:=ResetPointerValue, SRC:=SourceData,
    OFF:=PositionInTable, END=>PointerStatus,
    DEST=>DestinationTable)

Representation in ST

Representation:

R2T_Instance (NOINC:=FreezesPointerValue,
    R:=ResetPointerValue, SRC:=SourceData,
    OFF:=PositionInTable, END=>PointerStatus,
    DEST=>DestinationTable) ;

Parameter description

Description of input parameters:

Parameter	Data type	Description
NOINC	BOOL	1: freezes the pointer value
R	BOOL	1: resets the pointer value to zero
SRC	INT, DINT, UINT, UDINT, REAL	Source data to be copied in the current cycle

Description of input / output parameters:

Parameter	Data type	Description
OFF	UINT	OFF shows the position in the table. OFF is standardized with a reset (R), i.e. when R=1, OFF is set to "1". After the restore, OFF is incremented by 1.

Description of output parameters:

Parameter	Data type	Description
END	BOOL	1: Pointer value = Table length, i.e. table is full, the function block performs no further copy functions, and OFF is no longer incremented. The function block (and consequently END as well) can be reset with R=1.
DEST	ANY should be array of INT, DINT, UINT, UDINT or REALe.g. ARRAY[0..X] of INT	Destination register where source data will be copied in the cycle.

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.

REAL

The REAL type is encoded in a 32 bit format.

The possible value ranges are shown in the figure below:

When a result is:

between -1,175494e-38 and 1,175494e-38, it is considered to be a DEN;
less than -3.402824e+38, the symbol -INF (for - infinity) is displayed;
greater than +3.402824e+38, the symbol INF (for + infinity) is displayed;
undefined (square root of a negative number), the symbolNAN is displayed.

NOTE: The IEC 559 standard defines two classes of NAN: the silent NAN (QNAN) and the signaling NAN (SNAN). A QNAN is a NAN with a most significant fraction bit while an SNAN is a NAN without a most significant fraction bit (bit number 22). QNANs can be propagated via most arithmetic operations without throwing an exception. As for SNANs, they generally indicate n invalid operation when they are used as operands in arithmetic operations (see %SW17 and %S18).

NOTE: When a DEN (non-standardized number) is used as an operand, the result is not significant.