speed measurement - can use value DB X.DBD30?

dmelliot

im not quite sure what you are trying to do, but you should have a few options.

1) you can calculate the RPM based on the count and a time interval
or
2) if you set the module to RPM measurement, the module still returns a count. I am using CNT_CTL1 (FC2). it provides an RPM and count to the associated DB (RPM -> DBD30, count -> DBD34). The FM350-1 manual should tell you how to set up the RPM measurement (that is what i used). i will try to find a sample program i can post.

 If I have selected this operating mode - speed measurement:
can i use this value (DB X.DBD30) directly or do i need any additional processing.
I read a lot of things, but I don't understand - I get a lot of value.
I configure the module - 4 pins / pulse from the proximity switch, but I do not get a stable and normal value (I think so) .

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Split from FM 350-1 Frequency Measurement & Contineous counting .

yes you can but u have to scale the value your getting first with scaling block

or make your own formula by using calculation blocks 

I'm sorry, but I don't break what I need to scale?
When configuring it, you set how many pins there are per revolution (4 pins in my case).

Why do you need additional scaling? Does it matter in which block I do this scaling - for example OB35 ?
If I do it in OB35 - does it matter how much is set - block time cycle?
And what should this scaling formula include?
I apologize for the questions, but for the first time I am setting up such a module and the manual does not make it very clear to me.
What should be the update time?