Rakesh,
Use a CALC block with a connection to RI01 from the analog signal you wish to
evaluate.
The last statement in the CALC block should write the content of RI01 to RO01
and the first statements should compare RI01 & RO01 and generate the output you
desire.
When the block runs, RI01 gets updated with an "IN RI01" instruction and the
previous value of RI01 gets brought in with an "IN RO01" instruction, giving
you the current and previous values you need.
Jacques
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