Allen-Bradley Micro800 General Instructions Manual page 94

Programmable controllers

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Arithmetic instructions

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(* ST Equivalence: *)

selected := MUX4 ( RAND (4), 1, 4, 8, 16 );

random selection of 1 of 4 pre-defined values

the value issued of RAND call is in set [0..3],

so 'selected' issued from MUX4, will get 'randomly' the value

1 if 0 is issued from RAND,

or 4 if 1 is issued from RAND,

or 8 if 2 is issued from RAND,

or 16 if 3 is issued from RAND,

Rockwell Automation Publication 2080-RM001D-EN-E - February 2015