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7.4 RFB extension
In addition to transferring screen content, the RFB protocol (remote frame buffer protocol) is also used to transfer
data between a VNC client and the VNC server. This makes it possible to control VNC-based HMI applications.
These extensions can be configured in Automation Studio using library AsRfbExt.
Library AsRfbExt provides additional options for controlling VNC-based HMI applications and evaluating any input
devices connected to the client (B&R device). B&R's VNC Viewer must be used on the client with the RFB extension
enabled.
RFB extensions offer the following basic functions:
• Evaluating additional control devices on the Power Panel.
• Querying the temperature of the VNC client.
• Starting a process on the VNC client to carry out certain functions.
• Determining and limiting the number of connected VNC clients.
• Disconnecting VNC clients from the VNC server (Power Panel is not turned off, configurations remain).
• Reading the controller's operating hours.
Information:
For more information about RFB extensions and programming with library AsRfbExt, see the docu-
mentation in Automation Help.
Information:
Only one Power Panel with enabled RFB extension can be operated per B&R VNC server.
The following functions are described in this section:
•
Temperature monitoring
•
Adjusting display brightness
•
Outputting an audio signal
7.4.1 Temperature monitoring
Monitoring by the application
Necessary function of library AsRfbExt: RfbExtTemperatureValue()
Function RfbExtTemperatureValue() reads out the value of a temperature sensor in the device using a sensor index:
Sensor index
Description
0
SoC temperature (system on a chip).
1
Temperature of CPU core 1.
2
Temperature of CPU core 2.
Use case
Under certain circumstances (e.g. if the device is operated near the maximum permissible ambient temperature),
it makes sense for the application to monitor the temperature of the device. The application can take appropriate
measures if a certain temperature is exceeded.
Notice!
None of the measured temperatures is permitted to exceed 105°C. Continuously high temperatures
may reduce the service life of the processor or damage it.
Power Panel T80 User's manual V1.03
Software
75
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