PLC

After controller start-up, the PLC run-time system receives access to the shared memory areas for V.E. variables between CNC and PLC A distinction is made between in channel and global memory areas.

gpVE[iChannelndex]r

gpVEGlob

In order to simplify the simulation of the memory area for the PLC, it is recommended to export the variable after it is created using the # EXPORT VE command .
For more information see [FCT-C22// Description]

Manual simulation of the variable structure in the PLC

This PLC example below shows how V.E. variables can be used in the PLC by simulating variable structures.

Programing Example

Access to V.E. variables in the PLC

Definition of variable structures for V.E. variables:

TYPE VECTOR_T :

STRUCT

  x : LREAL;

  y : LREAL;

  z : LREAL;

END_STRUCT

END_TYPE

TYPE TARGET_POINT_T :

STRUCT

  point : VECTOR_T;

  valid : BOOL;

END_STRUCT

END_TYPE

TYPE TRAJEKTORIE_T :

STRUCT

  nbr_points : DINT;

  name : STRING(127);

  points : ARRAY [0..9] OF TARGET_POINT_T;

END_STRUCT

END_TYPE

Definition of structures for the complete assigned V.E. memory area:

TYPE VE_GLOBAL:

STRUCT

  var_global_1 : DINT;

END_STRUCT

END_TYPE

TYPE VE_CHAN_1:

STRUCT

  var_chan_1 : DINT;

  array_chan_1: ARRAY [0..19] OF INT;

  name : STRING(127);

  Trajectory: TRAJEKTORIE_T;

END_STRUCT

END_TYPE

PLC program to access V.E. variables of channel 1:

PROGAM V_E

  VAR

    p_ve_chan_1 : POINTER TO VE_CHAN_1;

  END_VAR

(* Channel 1 with index 0 - gpVECh[0]*)

p_ve_chan_1 := ADR (gpVECh[0]^.ext_var32[0]);

IF (p_ve_chan_1^.name = ‚’)

THEN

  p_ve_chan_1^.trajektorie.name := ‘My Path!’;

  p_ve_chan_1^.trajektorie.nbr_points := 2;

  p_ve_chan_1^.trajektorie.points[0].valid := TRUE;

  p_ve_chan_1^.trajektorie.points[0].point.x := 100.0;

  p_ve_chan_1^.trajektorie.points[0].point.y := 200.0;

  p_ve_chan_1^.trajektorie.points[0].point.z := 300.0;

  p_ve_chan_1^.trajektorie.points[1].valid := TRUE;

  p_ve_chan_1^.trajektorie.points[1].point.x := 200.0;

  p_ve_chan_1^.trajektorie.points[1].point.y := 400.0;

  p_ve_chan_1^.trajektorie.points[1].point.z := 600.0;

END_IF;