text: <s>[INST] PF70 par 415 Encoder Speed : range +/- 500 Hz too small? Hi, I have a PF70 EC drive with a 20A-ENC-1 encoder feedback module. My motor namplate RPM = 1740. I have a 1024 PPR quadrature encoder. I have a 20-COMM-E adaptor and I want to use this to bring the encoder speed into my ControlLogix processor (through 1756-ENBT Ethernet/IP module). From my understanding, the way to do this is to setup a datalink to read PF70 parameter 415 [Encoder Speed]. What confuses me is that the description of parameter 415 in the PF70 User Manual lists its Min/Max at -/+500 Hz. According to my calculations, at [Mtr Nmplt RPM] = 1740 and [Encoder PPR] = 1024: 1740 [rotations / minute] * 1024 [pulses / rotation] * [1 min / 60 sec] = 29,696 pulses / sec = 29,696 Hz at motor NP RPM. How can parameter 415's range of -/+500 Hz be enough to cover the speed range in my application? Thanks in advance, Paul [/INST] Hi Paul, I think you've misread the parameter description: :smileysurprised: 415 - Provides a monitoring point that reflects speed as seen from the feedback device. That doesn't mean the encoder rotation frequency, but the motor rotation frequency, or better, the calculated frequency measured through the encoder on the motor. So, if you have your drive commanded to run the motor at 60 Hz, you will see about 60 Hz coming from the feedback device in Param. 415. Also, 500 Hz is the maximum frequency the PF70EC can supply. I've not tested it, but this is how I understand it works. - fuzzy logic \\n </s>