Panasonic FP-E Programming Manual page 1251

Operation of DF instruction between MC and MCE instructions
When a leading edge detection instruction (DF instruction) is used with the MC and MCE instructions,
the derivative output may change as follows depending on the trigger of MC instruction and input timing
of DF instruction. Take care regarding this point.
Example 1:
When system register 4 sets 0 (conventional)
Time chart 1
Time chart 2
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