ItpReadRParamsEx

The ItpReadRParamsEx function block reads the NC’s calculation parameters, also known as R-parameters. A more detailed description of the calculation parameters can be found here. A total of 1000 R-parameters are available, of which the first 900 (0..899) are local, so that they are only visible in the current NC channel. The other 100 (900..999) R-parameters are global, and are thus visible from anywhere in the NC.

VAR_INPUT

VAR_INPUT
    bExecute       : BOOL;
    pAddr          : PVOID;
    nIndex         : DINT;
    nCount         : DINT;
    tTimeOut       : TIME;
END_VAR

bExecute: A rising edge starts the read operation.

pAddr: Address of the target variables of the data to be read. Data are written directly from the specified address, i.e. nIndex is not to be interpreted as offset from pAddr. The data are usually stored in an array of type LREAL, which has to be defined by the user.

nIndex: Describes the index of the R-parameter to be read from an NC perspective.

nCount: Number of R-parameters to be read

tTimeOut: ADS Timeout-Delay

VAR_IN_OUT

VAR_IN_OUT
    sNciToPlc           : NCTOPLC_NCICHANNEL_REF;
END_VAR

sNciToPlc: The structure of the cyclic channel interface from the NCI to the PLC. This structure is only accessed for reading. (type: NCTOPLC_NCICHANNEL_REF)

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