I am using a piece of hardware connected by ethernet to my PC with its own IP address. The unit sends me data from my test rig (16 differential channels) such as voltage, current, temp, pressure etc.
I am able to use ActiveX commands to get the data sent back. I am sampling data at about 1 second intervals and graphing it within Labview. The problem is that Labview consumes memory at about 4K every minute. I open a connection to the IP address send the ActiveX command receive the string of characters back and then close the connection (this procedure is repeated every second). The advice given by NI engineers was that it was the limitation of ActiveX communication layers, so I set about using Modbus TCP/IP instead.
I searched the knowledge base and found an example of using Modbus to communicate to a Festo controller written by an NI engineer. I adapted this to suit reading back one input register starting at address 1 and found it obtained the data from my own piece of hardware. Again, running this in a 1 second interval a memory leak of about 4K/minute occurs.
Neither approach is satisfactory as tests must run for months at a time without interruption.
Is the problem therefore not to do with Labview and not the communication layer protocols?
A solution would be greatly appreciated!!
