Get_Attribute_Single (FB)ΒΆ
FUNCTION_BLOCK Get_Attribute_Single EXTENDS BaseService
Use this function block for querying the attribute of a specific instance of a CIP object.
Note
Data received and send needs to be swapped. See parent folder.
(* CIP Data type for string with a length of max. 64 chars *)
TYPE STRING64 :
STRUCT
uiLength : UINT;
sString : STRING(63);
END_STRUCT
END_TYPE
PROGRAM PLC_PRG
VAR
strHostnameToGet : STRING64;
getAttributeSingle : ENIP.Get_Attribute_Single ;
udiReceivedData : UDINT;
END_VAR
getAttributeSingle(
xExecute:= ,
itfEtherNetIPDevice:= EtherNetIP_Adapter, (* instance of the device (instance is found in the I/O Mapping of the device) *)
eClass:= ENIP.CIPClass.TCPIPInterfaceObject, (* cip class which contains the desired attribute *)
dwInstance:= 1, (* value of 0 is class level, range from 1..x is instance level *)
wAttribute:= 6, (* attribute no. 6 of the tcp/ip interface object is the Hostname (CIP Spec. Vol.2 Chapter 5-3.3.2.6)*)
pData:= ADR(strHostnameToGet), (* data buffer *)
udiDataSize:= SIZEOF(strHostnameToGet), (* size of the data buffer *)
xDone=> ,
xBusy=> ,
xError=> ,
eError=> ,
udiReceivedDataSize=> udiReceivedData ); (* if the request was successful, udiReceivedData contains the number of bytes which have been received *)
;