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.
VAR_INPUT
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
sNetId: AMSNetId of the TwinCAT EtherNet/IP scanner through which the command is to run
sIPv4Addr: IP address of the target CPU
bExecute. A positive edge starts the command
bDataTableWrite: FALSE triggers a DataTableRead, TRUE a DataTableWrite
sSrcElementName: String for the source name
sDstElementName: String for the target name
nNumberOfElements: Number of elements
nLocalIndex: For ARRAYs the start index has to be set to indicate from which ARRAY index the data should be taken (local system)
nRemoteIndex: For ARRAYs the start index has to be set to indicate from which ARRAY index the data should be taken (remote system)
nSessionTimeoutMSec: Timeout for the session; the default is 30 seconds
nCmdTimeoutMSec: Timeout for the command; the default is 7.5 seconds
bRackComm: TRUE if the CPU is modular, i.e. a CPU with a rack design, for example a CompactLogix
nPort: Port number of the CPU (usually 1)
nSlot: Slot number if the CPU is not plugged into slot 0
VAR_OUTPUT
VAR_OUTPUT
bBusy : BOOL;
bError : BOOL;
nErrId : UDINT;
END_VAR
bBusy: When the function block is activated this output is set. It remains set until a feedback is received. While Busy = TRUE, no new command will be accepted at the inputs.
bError: If an error should occur during the transfer of the command, then this output is set once the bBusy output was reset.
nErrId: If an bError output is set, this parameter supplies an error number.
Example
 | 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';
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_HELPSTRING(FB_CIP_DATA_TABLE_RDWR.nErrId;
END_IF