Behavior in the event of communication errors

An individual Fallback mode with restart delay can be configured for setpoints, measured values and control values of the power generating plant via the parameter group Plant (see Plant). This function is anchored in the requirements of the VDE and EN standards.

Function of the Fallback mode

The Fallback mode defines the behavior of the controller in the event of communication failures with the following components:

• the grid operator (Operator) - concerns setpoints from the grid control system
• the direct marketing company (Marketer) - concerns setpoints from marketing
• the power generating plant (Plant) - concerns the feedback and control of the units
• the grid data acquisition (Measure) - concerns measured values at the point of common coupling (PCC)

A failure of the respective communication connection is detected via assigned status flags of the control interface (see Operating specifications of the controller) and signaled to the controller.

Available Fallback modes

Depending on the configuration, the controller responds as follows in the event of an error:

• Default: The default configured as a parameter is used as the setpoint
• Last: The last valid setpoint will continue to be used

This is also saved and restored via the Persistent Control when the system is restarted. This Fallback logic is also active when the controller starts up after activation via bEnable = TRUE, even if there is no valid communication at this time.