Chapter 1
OPC server of the REX Control System
The standard installation package of the REX Control System development tools includes also an OPC server, which can serve as a data exchange point between visualization system (SCADA, HMI) and the running control algorithm.
There are many visualization systems of third parties, e.g. InTouch, Indusoft, Genesis, WinCC, Citect or Reliance, to name a few. Some of them are even free for personal and non-commercial use.
The OPC server of the REX Control System runs only on Microsoft Windows Vista/7/8/10. It communicates with the REX target device via proprietary communication protocol and provides data exchange with the visualization software via the OPC protocol. The current version of the REX OPC Server supports OPC Data Access 2.0 and 3.0 specification. The visualization packages include a broad range of tools and graphical elements to process the data and the creation of professional and detailed visualization of the controlled technology is quite straightforward.
It is necessary to define the IP address of the REX target device in Windows registry to
allow data exchange with the OPC server. Find the following key in the Windows
registry
HKLM\SOFTWARE\Wow6432Node\REX Controls\REX_X_XX_X_XXXX\RexOPCsvr
and set the IP address of the REX target device into TargetName.
Afterwards it is possible to establish data exchange with the running executive of the REX Control System from the visualization software. The OPC server named REXControls.RexOPCsvr allows the visualization SW to read all inputs, outputs and parameters of the function blocks the control algorithm is composed of. It is possible to write to function block parameters and inputs. For the latter case, no signal can be connected to the block input in the control algorithm.
[Previous] [Back to top] [Up] [Next]