What is this Simulink Block With an arrow Sign on it?

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I wan constructing a Simulink model from a pdf document when I came across a block with an arrow in it. (Image is attached; MEAN BLOCK) This block is not a part of Simulink Library? I wanna ask is it a user defined block or is it a subsystem?

Answers (1)

Mischa Kim
Mischa Kim on 24 Apr 2015
Abid, this is a masked subsystem. Click on the down arrow in the lower right corner of the block to open up the subsytem.

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