What kind of source block is this?

Hi, I would like to know what kind of Simulink source block is this, I'm studying a full model for single wheelset traction control with a constant locomotive speed, and this block represents the friction constant for dry and wet rails:

Note: This isn't an editable file from Simulink, its a PrintScreen from a pdf of the book "Design and Simulation of Heavy haul Locomotives and Trains". The project was designed at Simulink, but I don't have the original .slx file.

Answer 1

[Fangjun Jiang]

double click to open it. The title of the dialog window shall tell the block type.

[Camila Moscibrocki]

Hi, this isn't an editable file from Simulink, its a PrintScreen from a pdf of the book Design and Simulation of Heavy haul Locomotives and Trains". The project was designed at Simulink, but I don't have the original .slx file.

[Fangjun Jiang]

If the PDF file is generated by report generator or Webview, you might be able to hover over in PDF file and it will display some info.

Anyway, it looks like a "Repeating Sequence" block. You can try this block, specifying data that represents a negative pulse.