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| 10/5/2010 7:25 AM | |
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Posts: 1 Rating:
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Ola Denilson, saudações à minha terra natal :) Greetings I am sure I’m knocking on the wrong door (I’m new in the forum, this is my first post, so be gentle :) , but it is about RPM, so perhaps you could probably show me the right way… I am doing an engine monitoring PLC, driving an electrical generator. I’m using a 313C-2 DP CPU, a SM334 and a couple of SM331’s. I have stumbled into the question on how to measure RPM, for which I’m still clueless. Is my HW enough or do I need to add another module? And then, how do I proceed? I read I need an encoder? Do you have a sample for S7:300 cpu’s? Any help is highly appreciated. Thanks, Kai Splitted from How to calculate frequency from counting pulses measurement. |
Last edited by: O_Moderator at: 10/6/2010 11:27 AMnew subject after splitting |
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| 10/6/2010 2:34 PM | |
Joined: 8/31/2005 Last visit: 8/20/2024 Posts: 2198 Rating:
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With your HW you can meter a frequency up to 30 kHz. So you may use a incremental encoder and count its pulses with the CPU313C. example: encoder with 1024 pulses per rotation max speed is 1500 rotation per minute ( =25 rotation per second) max frequency=1024 p/r * 25 r/s= 25,6 p/s => 25,6 kHz See here for programming details and here for a example. |
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