How can use HSI inputs like Shaft Encoder at JAZZ plc

[bettim]

Hi all,

I need to connect Incremental Shaft Encoder at JAZZ plc

Can anybody help me to use two HSI inputs at JAZZ like M90, Shaft Encoder

Best Regards

[Emil]

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.

[bettim]

Thank you, Emil

I made program “U90Ladder” to use two inputs of Jazz like A&B signals but rotating speed must be small and encoder with small number imp/rot.

[Emil]

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.

[bettim]

Hi,Emil

Yes, but Jazz plc have two high speed inputs, If I use like counter input is working well with high speed

I will tray sometime and forget it.

[Joe Tauser]

It's not a matter of subtracting one counter from another. You have to write logic to determine which input goes on first to see which way the encoder is turning. Do a Google search on "quadrature encoder" to see how the A & B signals work together.

Joe T.

[bettim]

Hi,Joe T.

I made program for encoder it is working,right rotation count up left rotation count down but ,

reading speed is very small.

If you have solution for Jazz plc send me. (I need to connect encoder with 500 imp/rot in Jazz plc)

Regards