RMCLink COM Component RMCLink.ReadLFile Method |
Reads one or more integer (L) registers from the controller. This method cannot be used in VBScript or JScript; use the ReadLFile_Script method instead. ReadLFile is typically used to read RMC100 registers (which are all integer registers), or to read RMC70, RMC150, or RMC200 registers in integer format.
Visual Basic (Declaration) |
Function ReadLFile ( _ file As Long, _ element As Long, _ count As Long _ ) As Variant |
Visual Basic (Usage) |
Dim instance As RMCLink Dim file As Long Dim element As Long Dim count As Long Dim returnValue As Variant
returnValue = instance.ReadLFile(file, element, count) |
file
File number of the first register to be read. See the RMCLink Register Reference for details.
element
Element number of the first register to be read. See the RMCLink Register Reference for details.
count
The number of registers to read.
This variant will be filled with the data read from the controller. The variant data type will be a single-dimension 0-based array of Long elements. The length is determined by count.
The only difference between ReadLFile_Script and ReadLFile is the format of the data returned in the Variant return value. For ReadLFile, the Variant holds a single-dimension 0-based array of Long elements. For ReadLFile_Script, the Variant holds a single-dimension 0-based array of Variant elements, and each Variant element in turn holds a Long. This extra layer of indirection is required by some scripting languages (VBScript and JScript, for example), but is other less efficient and should be avoided when ReadLFile is supported by your language.
For details on integer (L) and floating-point (F) registers and how to read from and write to both, see RMC100 Register Data Types or RMC70, RMC150, and RMC200 Register Data Types.
This method is synchronous, which means that it will not return until the read is completed, which may take several seconds. If this method is called on the main thread, then the application will likely be unresponsive until this method completes. For applications where this is not acceptable, this and other synchronous methods should be called from a worker thread, and may use the CancelRequest method to cancel an in progress request.
Error Code |
Description |
rmcEOutOfMemory = 5 |
Out of memory. |
rmcEInvalidArg = 7 |
One of the file, element, or counts parameters are out of range. |
rmcEDisconnecting = 1002 |
Link is being disconnected by another thread. |
rmcEDisconnected = 1005 |
The link has not been connected. |
rmcESocketInternal = 1008 |
Internal socket error. |
rmcECancelled = 1010 |
Operation cancelled by call to CancelRequest. |
rmcETimeout = 1011 |
Operation timed out. |
rmcESocketGracefullyClosed = 1014 |
TCP/IP connection closed by remote device. |
rmcESocketReadError = 1015 |
Connection error while waiting for response from the remote device. |
rmcESocketInvReadLen = 1016 |
Connection error while waiting for response from the remote device. |
rmcESocketWriteError = 1017 |
Connection error while sending request to the remote device. |
rmcESocketInvWriteLen = 1018 |
Connection error while sending request to the remote device. |
rmcESerialIOE = 1021 |
Serial IOE error. |
rmcESerialFramingError = 1022 |
Serial framing error. |
rmcESerialBreak = 1023 |
Serial Break error. |
rmcESerialOverrun = 1024 |
Serial overrun. |
rmcESerialRxOverrun = 1025 |
Serial receive overrun. |
rmcESerialParityError = 1026 |
Serial parity error. |
rmcESerialTxFull = 1027 |
Serial transmitter full. |
rmcEConnectionBroken = 1028 |
Connection broken. |
rmcEPartialWrite = 1029 |
Unable to send full request to the remote device. |
rmcEBadAddress = 1032 |
Attempt to read beyond the end of a file. |
rmcEUSBInternal1 = 1051 |
Internal USB driver error. |
rmcEUSBOperationAborted = 1053 |
Unsuccessful transfer of data between the PC and the controller. Ensure that the physical connection between the PC and controller is still intact. |
rmcEUSBDisconnected = 1054 |
The controller appears to have been disconnected from the USB port. Ensure that the physical connection between the PC and controller is still intact. |
The following code example illustrates the use of the ReadLFile method.
Visual Basic 6 / VBA |
Option Explicit
Public Sub Sample()
' Declare and create the RMCLinkServer COM object.
Dim srv As New RMCLinkServer
' Use our RMCLinkServer to create the correct type of RMCLink object.
Dim rmc As RMCLink
Set rmc = srv.CreateEthernetLink(dtRMC100, "192.168.0.28")
' Establish the connection.
rmc.Connect
' Read L0:1-2 (Axis 0 Target and Actual Positions)
Dim data As Variant
data = rmc.ReadLFile(fn100StatusAxis0, 1, 2)
resultText = "Target Pos. = " & data(0) & ", Actual Pos. = " & data(1)
' Close the connection.
rmc.Disconnect
End Sub
|
See Also
RMCLink Class | RMCLink COM Component | ReadLFile_Script | ReadFFile
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