Indicate S-Function block is a SimViewingDevice
Indicates the S-Function block referencing this S-function is a SimViewingDevice. As long as the block meets the other requirements for a SimViewingDevice, i.e., no states, no outputs, etc., the Simulink® engine considers the block to be an external mode block. As an external mode block, the block appears in the external mode user interface and the Simulink Coder™ product does not generate code for it. During an external mode simulation, the engine runs the block only on the host. See Sim Viewing Devices in External Mode in Writing S-Functions for more information.