In the example above, data memory 102
(DM102) initially holds the constant (number) 0000. Each time the operator pushes
button 0000 the difu instruction will turn on (become true) FOR
ONE SCAN. When this happens we load the value(number) in DM100(100) and
add it to the value(number) in DM101(200). The result, 300 in this example (100+200=300)
is then stored in DM102(300).
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