R-Parameters

Arithmetic Parameters

The arithmetic parameters, for short known as R-parameters, are interpreter variables that are named by an expression of the form “R<n>”. Since ‘n’ is an integer in the range 0..999, a total of 1000 R-parameters are available. The first 900 values R0..R899 of these are local variables for the NC channel. They can only be accessed by the interpreter of the channel. The R-parameters R900..R999 are declared globally. They exist only once for each NC, and all channels access the same storage. This kind of accessibility organization makes it possible to exchange data (e.g. for part tracing, collision avoidance etc.) beyond channel boundaries.

Assigning a Value to an R-Parameter

Assigning a value to an R-parameter is merely possible within Structured Text. There are two ways of assigning a value to an R-parameter. The value can be assigned directly or the rSet function can be employed. The function rSet is suitable to use when the index of the R-parameter to be assigned should not be determined until runtime.

Structured Text: Assigning an R-Parameter Value Directly

R<n> := LReal;

Example

!R1 := 7;

Structured Text: Assigning an R-Parameter Value with the “rSet” Function

rSet(index := LINT, value := LREAL)

Example

!rSet(1, 7);

Reading an R-Parameter Value

There are two ways of reading an R-parameter. An R-parameter can be used in G-Code directly or it can be extracted within Structured Text using the rGet function. The function rGet extracts an R-parameter value according to its index.

Structured Text: Reading an R-Parameter Value with the “rGet” Function

rGet(index := LINT) : LREAL

G-Code Example: Extracting an R-Parameter Value Directly

!R1 := 7;
N10 G01 X=R1 F6000

G-Code Example: Extracting an R-Parameter Value with the “rGet” Function

!R1 := 7;
N10 G01 X={rGet(1)} F6000

Example: Assigning and Extracting

{
VAR
    valueR1 : LREAL;
END_VAR

rSet(1, 7);
valueR1 := rGet(1);

R2 := 10;
R3 := R1 + R2;

!N10 G01 X=R1 Y0 Z=R2 F6000
!N20 G01 X={rGet(3)}

MSG(toString('R1 = ', valueR1, ',R2 = ', rGet(2), ', R3 = ', R3));
}
M02

Output:

R1 = 7.000000, R2 = 10.000000, R3 = 17.000000

R-Parameters in Subroutines (Functions) Within a subroutine (function) an R-parameter has to be declared via a VAR_EXTERNAL declaration. Example: { FUNCTION myFunction : LREAL VAR_EXTERNAL     R45: LREAL; END_VAR } N10 G01 X=R45 F6000 !END_FUNCTION

Requirements