FB_CIP_DATA_TABLE_RDWR

Variables are read and written from TwinCAT via a function block that is part of the Tc2_EthernetIP.

The function block FB_CIP_DATA_TABLE_RDWR can be used for reading and writing.

Inputs

VAR_INPUT
    sNetId               : T_AmsNetID;
    sIPv4Addr            : T_IPv4Addr;
    bExecute             : BOOL;
    bDataTableWrite      : BOOL;
    sSrcElementName      : WORD;
    sDstElementName      : WORD;
    nNumberOfElements    : POINTER TO BYTE;
    nLocalIndex          : WORD;
    nRemoteIndex         : DWORD;
    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 CPU.
bExecute	BOOL	A positive edge starts the command.
bDataTableWrite	BOOL	FALSE triggers a DataTableRead, TRUE a DataTableWrite.
sSrcElementName	WORD	String for the source name.
sDstElementName	WORD	String for the target name.
nNumberOfElements	POINTER OF BYTE	Number of elements
nLocalIndex	WORD	For ARRAYs the start index has to be set to indicate from which ARRAY index the data should be taken (local system).
nRemoteIndex	DWORD	For ARRAYs the start index has to be set to indicate from which ARRAY index the data should be taken (remote system).
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 (usually 1).
nSlot	BYTE	Slot number if the CPU is not plugged into slot 0.

Outputs

VAR_OUTPUT
  bBusy    : BOOL;
  bError   : BOOL;
  nErrId   : UDINT;
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.

Sample

	Removing test code If you have already tested the communication from AB to Beckhoff, you should remove the function calls to DataTable Read/Write from the AB project.

VAR
    FB_CIP_DATA_TABLE_RDWR: FB_CIP_DATA_TABLE_RDWR;
    SourceName: STRING := 'Test';
    DestName: STRING := 'ETHIP.Test';
    Error: STRING;
END_VAR

FB_CIP_DATA_TABLE_RDWR(
  sNetId:='5.18.71.214.4.1' , 
  sIPv4Addr:='192.168.1.220' , 
  bExecute:=TRUE , 
  bDataTableWrite:= , 
  sSrcElementName:=(SourceName) , 
  sDstElementName:=(DestName) , 
  nNumberOfElements:=1 , 
  nLocalIndex:= , 
  nRemoteIndex:= , 
  nSessionTimeoutMSec:= , 
  nCmdTimeoutMSec:= , 
  bRackComm:=TRUE , 
  nPort:= , 
  nSlot:= , 
  bBusy=> , 
  bError=> , 
  nErrId=> );
IF NOT FB_CIP_DATA_TABLE_RDWR.bBusy THEN
  FB_CIP_DATA_TABLE_RDWR(bExecute:=FALSE);
  Error:=F_GET_ETHERNETIP_ERROR_TEXT (FB_CIP_DATA_TABLE_RDWR.nErrId);
END_IF