ItpReadZeroShift

ItpReadZeroShift 1:

The ItpReadZeroShift function block reads the offset shift components X, Y and Z for the given zero offset shift.

ItpReadZeroShift 2:

For reasons of compatibility, there are two entries (coarse and fine) for each axis in each zero offset shift (e.g. G54). These two entries must be added together. This function block evaluates both the entries and adds them together automatically.

ItpReadZeroShift 3:

Outdated version

The sole purpose of the function block is to ensure compatibility with existing projects. For new projects please use the function block ItpReadZeroShiftEx.

ItpReadZeroShift 4: Inputs

VAR_INPUT
    bExecute       : BOOL;
    nChnId         : UDINT;
    nZsNo          : UDINT;
    tTimeOut       : TIME;
END_VAR

Name

Type

Description

bExecute

BOOL

A rising edge starts the read operation.

nChnId

UDINT

Channel ID

nZsNo

UDINT

Number of the zero offset shift; on the NC side G54 to G59 are zero offset shifts. The valid range of values for 'nZsNo' is therefore from 54 to 59.

tTimeOut

TIME

ADS Timeout-Delay

ItpReadZeroShift 5:/ItpReadZeroShift 6: Inputs/Outputs

VAR_IN_OUT
    sZeroShiftDesc : ZeroShiftDesc;
END_VAR

Name

Type

Description

sZeroShiftDesc

ZeroShiftDesc

The structure containing the components of the zero offset shift.

ItpReadZeroShift 7: 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).

TYPE ZeroShiftDesc:
STRUCT
    fShiftX        : LREAL;
    fShiftY        : LREAL;
    fShiftZ        : LREAL;
END_STRUCT
END_TYPE

See also:

ItpWriteZeroShift; ItpSetZeroShiftNull

Requirements

Development environment

Target platform

PLC libraries to be linked

TwinCAT v3.1.0

PC or CX (x86 or x64)

Tc2_NCI