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How can use HSI inputs like Shaft Encoder at JAZZ plc

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The "shaft encoder" funciton (recognizing rotating direction according to A & B signals) - "like in M91" is hardware, microprocessor funciton. CPU of Jazz doesn't support this function. If you really need ot connect shaft encoder A and B signals, you need to use at least M91.

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Theoretically, this is possible and can be done in Ladder. You just need ot compare status of two inputs. In first though I think this will take 2 to 4 nets. Maybe I'm missing somethhing...

But - this will work really, really slow. I think - no more than 10 pulses per second.

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