FLT - Fault inputs

At the hardware level, FLT inputs are special-purpose digital inputs that can be configured to generate a “hardware fault” in order to instantly disable all PWM outputs in case of inadequate operation (similar to an analog input limit fault or any other fault). This block and the associated C/C++ routine control the activation of these inputs. They also provide means to read the value of the corresponding pin at the CPU execution rate.

FLT inputs are typically useful to retrieve fault feedback information from imperix modules (if needed) or custom-designed gate drivers. When optical fibers are used, the optical expansion board can be useful for that purpose. More information about the hardware protections present on imperix controllers is provided in PN263.

The table below outlines the location and logic-voltage levels of the FLT input across imperix controllers. Detailed information is available in the product datasheets.

Simulink block

Signal specification

The output signal returns the value of one FLT pin.

Parameters

• Device ID selects which device to address when used in a multi-device configuration.
• Fault input(s) (vectorizable) selects the pin(s) to read.
• Activate fault input enables the generation of a “hardware fault” if the pin goes high, immediately blocking all PWM outputs.

PLECS block

Signal specification

The output signal returns a vector containing the values of the FLT pins. The vector size is defined by the number of FLT pin(s) read, which is specified by the parameter Fault input(s).

Parameters

• Device ID selects which device to address when used in a multi-device configuration.
• Fault input(s) (vectorizable) selects the pin(s) to read.
• Activate fault input enable the generation of a “hardware fault” if the pin goes high and immediately disable all the PWM outputs.

C++ functions

void Flt_ActivateFaultInput(tFaultInput input, unsigned int device=0);Code language: C++ (cpp)

int Flt_GetBit(unsigned int bit, unsigned int device=0);Code language: C++ (cpp)

int Flt_Get(unsigned int device=0);Code language: C++ (cpp)