The licensing boundary depends on where the project executes. The stated 1-hour restriction applies when a PC executes the project as a SCADA station, not when the controller executes it.
Separate Development, Controller, and PC Execution
The MasterSCADA 4D development environment for the PLC program is described as free. Creating a project on a PC and downloading it to the controller does not make the PC the runtime host: after download, the embedded controller runtime executes the project without the stated 1-hour PC restriction.
| Function | Execution location | Licensing evidence |
|---|---|---|
| Develop and download the PLC project | PC | Development environment is free. |
Controller Project Limits
The controller project is described as having no control-point licensing limit comparable to a SCADA point-count license. This does not mean the controller has unlimited capacity: available controller memory remains the physical project limit. The evidence does not provide a memory capacity, supported register count, or method for calculating maximum project size.
Simultaneous web clients are also limited, but the evidence gives no numeric connection limit. Confirm the permitted concurrent-client count for the purchased controller before defining operator access requirements.
Integrated PLC, Web, and SCADA Projects
MasterSCADA 4D can contain the PLC program, the controller's browser-based visualization, and a PC-based SCADA application within one development project. The controller's web component belongs to the controller project, while using a PC as a full SCADA station is a separate licensing decision.
Do not infer that rule from the controller's embedded-runtime license; verify the workstation license terms before selecting its point capacity.
Commissioning Verification
- Create the PLC and web-visualization portions in the free development environment.
- If the PC must remain an operating SCADA station, select a separate workstation license and confirm how its point count treats controller and peripheral data.
- Connect the required browser sessions concurrently and verify them against the supported web-client limit obtained for the controller.
Stability on a real installation is not established by the supplied evidence, so validate required functions, communications, web access, and sustained execution during commissioning.
FAQ
No.
The evidence states that simultaneous web clients are limited but gives no numeric limit. It also does not define whether a SCADA workstation counts the controller as one point or counts its peripheral data separately, so confirm both rules before sizing the license.
