Software-specific information • RFB extension
Power Panel T30 User's manual V1.42 - Translation of the original documentation
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6.4 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 library 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 (e.g. Hand button).
•
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).
•
Read the controller's operating hours.
Information:
Additional information about the RFB extensions and programming with the
AsRfbExt
library can be
found in Automation Help.
Information:
Only a Power Panel with RFB extensions enabled can be operated via B&R VNC server.
The following functions are described in this section:
•
•
Starting touch screen calibration
•
•
6.4.1 Temperature monitoring
Required function in library
AsRfbExt
:
RfbExtTemperatureValue()
Function
RfbExtTemperatureValue()
is used to read the value of one of the following temperature sensors on the
device.
•
Temperature of the CPU housing (index 0: TemperatureCPUCase)
•
Internal temperature of the Power Panels (Index 1: TemperatureEnvironmental)
Important!
In worst case operation, the temperature of the CPU housing can achieve temperatures over 100°C.
Use case
Under certain circumstances (e.g. specified distances to ventilation cannot be observed, see
), it makes sense for the application to monitor the Power Panel temperature. The application
can take appropriate corrective measures if a certain temperature is exceeded.
Important!
The temperature within the housing is not permitted to exceed 85°C.
