FB_GET_ATTRIBUTE_SINGLE

The function block FB_GET_ATTRIBUTE_SINGLE enables reading of parameters from an EtherNet/IP device.

Service Code: 0x0E

Inputs

VAR_INPUT
    sNetId               : T_AmsNetID;
    sIPv4Addr            : T_IPv4Addr;
    bExecute             : BOOL;
    nClass               : WORD;
    nInstance            : WORD;
    nAttribute           : WORD;
    pDst                 : POINTER TO BYTE;
    nMaxLen              : WORD;
    nSessionTimeoutMSec  : DWORD;
    nCmdTimeoutMSec      : DWORD;
    bRackComm            : BOOL;
    nPort                : BYTE;
    nSlot                : BYTE;
END_VAR

Name	Type	Description
sNetId	T_AmsNetID	AMSNetId of the TwinCAT EtherNet/IP™ scanner via which the command is to run
sIPv4Addr	T_IPv4Addr	IP address of the target device.
bExecute	BOOL	A positive edge starts the command.
nClass	WORD	Class number of the CIP service
nInstance	WORD	Instance number of the CIP service
nAttribute	WORD	Attribute number of CIP service
pDst	POINTER OF BYTE	Pointer to the variable into which the value is to be copied (get the pointer with ADR)
nMaxLen	WORD	Size of the variable to which the pointer pDst points (get with SizeOf)
nSessionTimeoutMSec	DWORD	Timeout for the session; the default is 30 seconds
nCmdTimeoutMSec	DWORD	Timeout for the command; the default is 7.5 seconds
bRackComm	BOOL	TRUE if the CPU is modular, i.e. a CPU with a rack design, for example a CompactLogix
nPort	BYTE	Port number of the CPU (the TF6281 currently only supports port 1)
nSlot	BYTE	Slot number if the CPU is not plugged into slot 0

Outputs

VAR_OUTPUT
    bBusy     : BOOL;
    bError    : BOOL;
    nErrId    : UDINT;
    nDataLen  : WORD;
END_VAR

Name	Type	Description
bBusy	BOOL	When the function block is enabled, this output is set and remains set until a feedback is received. While Busy = TRUE, no new command will be accepted at the inputs.
bError	BOOL	If an error occurs during the transfer of the command, then this output is set once the bBusy output was reset.
nErrId	UDINT	If an bError output is set, this parameter supplies an error number.
nDataLen	WORD	Returns the number of valid data (number of bytes).