IOF_GetDeviceIDs

IOF_GetDeviceIDs 1:

The IOF_GetDeviceIDs function block reads the device IDs of all configured and active I/O devices into a data buffer. The data buffer can be defined as an array of Word variables. If successful, the function block returns the total number of the device IDs that exist in the first data word, while the remaining data words contain the corresponding device IDs of the individual I/O devices. The device IDs are specified by the TwinCAT system during the configuration and cannot be configured by the user.

Inputs

VAR_INPUT
    NETID    : T_AmsNetId;
    LEN      : UDINT;
    DESTADDR : PVOID;
    START    : BOOL;
    TMOUT    : TIME := DEFAULT_ADS_TIMEOUT;
END_VAR

Name	Type	Description
NETID	T_AmsNetId	The network address of the TwinCAT computer on which the ADS command is to be executed can be specified here. For the local computer an empty string may be specified.
LEN	UINT	The length in bytes of the data buffer into which the device IDs are to be read.
DESTADDR	PVOID	Address of the data buffer into which the device IDs are to be read.
START	BOOL	The function block is enabled by a positive edge at this input.
TMOUT	TIME	Specifies the time-out period that must not be exceeded when the command is executed.

Sample:

PROGRAM MAIN
VAR
    IOF_GetDeviceIds1 : IOF_GetDeviceIDs;
    IdsData           : ARRAY[1..201] OF WORD;
    StartGetDevIds    : BOOL;
    GetDevIds_Busy    : BOOL;
    GetDevIds_Err     : BOOL;
    GetDevIds_ErrId   : UDINT;
END_VAR

Outputs

VAR_OUTPUT
    BUSY    : BOOL;
    ERR     : BOOL;
    ERRID   : UDINT;
END_VAR

Name	Type	Description
BUSY	BOOL	When the function block is enabled, this output is set and remains set until a feedback is received.
ERR	BOOL	If an error should occur during the transfer of the command, then this output is set once the BUSY output was reset.
ERRID	UDINT	Returns the ADS error number when the ERR output is set.

Requirements

Development environment	Target platform	IO hardware	PLC libraries to be integrated (category group)
TwinCAT v3.1.0	PC or CX (x86, x64, ARM)	All IO devices	Tc2_IoFunctions (IO)