Hello ,i have a rotary pressing device with up to 10 positions.The Drive is AC motor with 1024ppr encoder,Danfoss FC300 frequence inverter and PLC-AB Micrologix1200.How can i calculate the RPM with the some encoder ,that i have in my program .I must reset the encoder data every second( to calculate the RPM) ,but that is not ok for my program .Sorry for my English
The part of my ladder you can see below

Hi Alex

There is an example of calculating RPM starting on page E28 of the Micrologix 1000 users manual
http://literature.rockwellautomation.com/i...um003_-en-p.pdf
The same should work fine for the 1200

Thanks a lot ,the machine run perfect .I used 3 level speed control, with 60% of the setpoint the speed decrease with 30% ,by 90% of the setpoint the speed decrease one more time with 15% and by 100% of the setpoint is seto to 0. The motor running with 1750RPM and I have 0% position error by stop.I run the motor drive with 4 DO -relay output ( each for the three different speed levels and 1 for enable )

Thank you one more time for the help! Alex