IOF_SER_IDN_Read

VAR_INPUT

VAR_INPUT
    sNetId     : T_AmsNetId;
    nIDN       : UINT;
    bExecute   : BOOL;
    nPort      : UINT;
    nMode      : DINT;
    nAttrib    : DWORD;
    cbLen      : UDINT;
    dwDestAddr : PVOID;
    tTimeout   : TIME := DEFAULT_ADS_TIMEOUT;
END_VAR

sNetId: The network address of the TwinCAT computer on which the ADS command is to be executed can be entered here (type: T_AmsNetId). If it is to be run on the local computer, an empty string can be entered.

nIDN: contains the Sercos parameter number to be accessed for reading. nIDN must lie between 0 and 32767 for S-parameters and between 32768 and 65535 for P-parameters.

bExecute: the block is activated by a positive edge at this input.

nPort: The port number nPort is assigned by the TwinCAT system during the hardware configuration.

nMode: The read mode determines which part of the parameter is to be read.
nMode = 0: Value
nMode = 2: Name
nMode = 3: Attribute (always read in order to determine data type and size, unless nAttrib is <> 0)
nMode = 4: Unit (not available for every parameter)
nMode = 5: Minimum (not available for every parameter)
nMode = 6: Maximum (not available for every parameter)

nAttrib: Attribute of the parameter, if known. If nAttrib = 0, IOF_SER_IDN_Write first reads the parameter attribute of the drive before the value is written to the parameter of the drive.

cbLen: Maximum length of the data buffer that is to accept the value.

dwDestAddr: Address of the data buffer that is to accept the value.

tTimeout: States the length of the timeout that may not be exceeded during execution of the command.

VAR_OUTPUT

VAR_OUTPUT
    cbRead    : UDINT;
    nAttribRd : DWORD;
    sAttrib   : ST_SercosParamAttrib;
    bBusy     : BOOL;
    bError    : BOOL;
    nErrId    : UDINT;
END_VAR

cbRead: Number of bytes read and copied to dwDestAddr.

nAttribRd: Attribute of the parameter; can be saved for the next access (nAttrib) to the parameter.
sAttrib: contains the attribute nAttribRd of the Sercos parameter, broken down into individual variables (type: ST_SercosParamAttrib).
bBusy: When the function block is activated this output is set. It remains set until a feedback is received.

bError: If an error should occur during the transfer of the command, then this output is set once the bBusy output was reset.

nErrId: Returns the ADS error number or the specific function block error number if the ERR output is set.

Requirements