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I am executing DLNK in a 2ms timer interrupt, to refresh a CJ1W-NCF71 (Mechatrolink) module connected to CP1H. Without executing this instruction, the scan time is ~8.5ms. When executing in the end of the interrupt, the scan time increases to ~10ms. However, when executing in the first rung of the interrupt, the scan time increases to ~17ms. What makes the difference? Why so much difference? Any ideas? Just for information: the DLNK execution time is 0.426ms. Edited by Sergei Troizky

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