ItpReadZeroShift

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

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

	Outdated version The sole purpose of the function block is to ensure compatibility with existing projects.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.

VAR_INPUT

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

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

nChnId: Channel ID

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

tTimeOut: ADS Timeout-Delay

VAR_IN_OUT

VAR_IN_OUT
    sZeroShiftDesc : ZeroShiftDesc;
END_VAR

sZeroShiftDesc: The structure containing the components of the zero shift.

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

VAR_OUTPUT

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

bBusy: 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: 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: 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).

Requirements

Development environment	Target platform	PLC libraries to be linked
TwinCAT v3.1.0	PC or CX (x86 or x64)	Tc2_NCI