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Master Control Reset

  • Library:
  • MCR block


The MCR block implements the MCR instruction. The block simulates a master control relay that can selectively disable a section of rungs.



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Controls the execution of the block. EnableIn reflects the rung state preceding the block. If the rung state preceding the block is false, EnableIn is false, the block does not execute and the outputs are not updated.


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When the block executes, it automatically sets the EnableOut to false. This disables all the subsequent blocks on the rung.

Version History

Introduced in R2019a

See Also

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