ItpRetraceMoveBackward

ItpRetraceMoveBackward 1:

The function block ItpRetraceMoveBackward deals with the geometric entries at the actual position at the start of the part program (G-Code).

ItpRetraceMoveBackward 2: Inputs

VAR_INPUT
    bExecute           : BOOL;
    tTimeOut           : TIME;
END_VAR

Name

Type

Description

bExecute

BOOL

The command is triggered by a rising edge at this input.

tTimeOut

TIME

ADS Timeout-Delay

ItpRetraceMoveBackward 3:/ItpRetraceMoveBackward 4: Inputs/Outputs

VAR_IN_OUT
    sNciToPlc           : NCTOPLC_NCICHANNEL_REF;
END_VAR

Name

Type

Description

sNciToPlc

NCTOPLC_NCICHANNEL_REF

The structure of the cyclic channel interface from the NCI to the PLC. This structure is read-only (type: NCTOPLC_NCICHANNEL_REF).

ItpRetraceMoveBackward 5: Outputs 

VAR_OUTPUT
    bBusy     : BOOL;
    bErr      : BOOL;
    nErrId    : UDINT;
END_VAR

Name

Type

Description

bBusy

BOOL

This output remains TRUE until the function block has executed a command, but at the longest for the duration supplied to the 'Timeout' input. While Busy = TRUE, no new command will be accepted at the inputs. Please note that it is not the execution of the service but its acceptance whose time is monitored.

bErr

BOOL

This output is switched to TRUE as soon as an error occurs during the execution of a command. The command-specific error code is contained in 'nErrId'. Is reset to FALSE by the execution of a command at the inputs.

nErrId

UDINT

Contains the command-specific error code of the most recently executed command. Is reset to 0 by the execution of a command at the inputs. The error numbers in ErrId can be looked up in the ADS error documentation or in the NC error documentation (error codes above 0x4000).

Procedure

1. Enable feeder backup list (see ItpEnableFeederBackup).
The NC program is stopped with ItpEStopEx.
2. Wait and ensure that all axes in the group are at standstill.
3. Call ItpRetraceMoveBackward.
4. Stop backward movement with ItpEStop, otherwise the program returns to the start.
5. Call ItpRetraceMoveForward to move forward again.
6. Call ItpEStopEx and ItpRetraceMoveBackward etc., if required.

Notice

Do not use in conjunction with vertex blending. M-functions are suppressed during backward movement.

Voraussetzungen

Entwicklungsumgebung

Zielplattform

Einzubindende SPS-Bibliotheken

TwinCAT V3.1.0 Classic Interpreter

TwinCAT V3.1.4024.40 GST Interpreter

PC oder CX (x86 oder x64)

Tc2_NCI