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PmDataClient and PmWebClient - licence for PROMOTIC clients for Internet/Intranet/LAN

PROMOTIC uses the client-server model for communication in LAN and the Internet/Intranet.
- The server application provides its data.
- The client application on the contrary reads/changes the data from/on the server.

The PROMOTIC client can be:
1st The PROMOTIC application that reads/writes the data from/to the application of the Server type.
The PROMOTIC application (client) can exchange data with the server using the XML standard (or over the PROMOTIC "socket" interface, that is now considered obsolete).
2nd Web client that views the information (data or panels) in the form of HTML pages from the PROMOTIC Web server.
For viewing HTML pages, for example, Chrome, Firefox, Edge, InternetExplorer ... can be used.
These clients can visualize (or change) the data from the PROMOTIC Web server but not all is allowed to them that is allowed to the client application created and operated in the PROMOTIC system: for example, communication with PLC devices, creating user algorithms, etc.
3rd Another application that allows to read/write the XML data.

From business point of view we distinguish two types of clients - "runtime" licences:
- PmDataClient: See PmDataClient licence item.
This licence allows:
- Receive and send data by the XML standard (or the old fashion way by Sockets). These are the following data transfers:
- Communication between objects PmaData or PmaDataTable.
- Read XML data from the PmaAlarmGroup object.
- Read XML data from the PmaTrendGroup object.
- Use objects PmaWebDir (for offering HTML pages from disk file) and PmaWebInfo (for remote viewing the INFO system).
- PmWebClient: See PmWebClient licence item.
This licence allows everything like the "PmDataClient" and moreover it allows to view and get data from subsystems:
- On-line viewing application panels as automatically generated dynamic html page, so-called Web panels.
- Alarms and Events: viewing alarms and events on Web clients.
- Trends: viewing trends in the graph and table form.

Both clients licences enable to operate the client regardless of whether it is a PROMOTIC application or not. Licences for clients are stored (need to be purchased) to the PROMOTIC Web server. Then the server allows to communicate with as many clients as how many licences it has got. The licence is so-called "flying": Web clients can be started from various computers but the number of concurrently running clients must not exceed the number for which the runtime licence has been purchased. If, for example, the PROMOTIC Web server has got only one client licence, then only the first client that applies for the data, is connected. If this client doesn't apply for new data after 10 minutes, then it is unregistered from server and a new client can connect.
But if the client application runs on the same computer as the server one and if the server address is set on the client as "http://localhost/" or "http:/" (this means the general-purpose address for the local computer), then this client connects to the server always as the PmWebClient without no need to have a licence (i.e. local client is free of charge).

- The Development key contains 10 available clients of the PmWebClient type for testing purposes.
- In the PmFree type application, there are 2 available clients of the PmWebClient type.

Maximum and current count of connected clients can be found in runtime by the Pm.LicenceInfo method.
PROMOTIC 9.0.28 SCADA system documentation MICROSYS, spol. s r.o.

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