How to read spead of conveyor and value send in PLC

SIMATIC S7-200/300/400, Step7, PCS7, CFC, SFC, PDM, PLCSIM,
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jpavic
Posts: 8
Joined: Fri Feb 16, 2007 5:53 pm
Location: Croatia

How to read spead of conveyor and value send in PLC

Post by jpavic » Tue Apr 29, 2014 6:42 pm

Hello everyone !!
I need help Siemens step7.
Can somebody explain to me how I can read the speed of conveyor with encoder.
I want read the impulse of encoder with FM 350-2 in PLC and convert to anlogic value to put on analog output .
So when conveyor turn with bigger speed I have more impulses per minute and the analog value is bigger, and when conveyor turn with slower speed analog value is smaller.
If somebody have example of this program please send me.

SHKODRAN
Posts: 106
Joined: Wed Dec 24, 2008 4:37 pm
Location: Europe
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Re: How to read spead of conveyor and value send in PLC

Post by SHKODRAN » Sun May 04, 2014 8:56 pm

Hello ,
I do not understand very well , why you have need encoder and FM350 to read the speed of conveyor?
You can read the actual value of speed from drive !!

Tolits
Posts: 2
Joined: Wed Dec 11, 2013 12:56 am

Re: How to read spead of conveyor and value send in PLC

Post by Tolits » Fri Jun 12, 2015 11:54 am

yes you can akre read in HMI>>>

However you want to read using encoder to determine the actual spee by sychronizig ro other motor.

it is also my problem right now...

I had try to configure in hardware descriptions using the 312CDP by clicking the Counter.

i think it will work but need to do it in actual - dont have a encoder INPUT yet..

Is it necessary to use PNP or NPN but the built-in Input of CPU is PNP.

Please continue and sent the result.

Dfcz
Posts: 691
Joined: Tue Dec 26, 2006 5:21 am
Location: Russia

Re: How to read spead of conveyor and value send in PLC

Post by Dfcz » Thu Jul 02, 2015 6:30 am

SHKODRAN wrote:Hello ,
I do not understand very well , why you have need encoder and FM350 to read the speed of conveyor?
You can read the actual value of speed from drive !!
+ + +
To have FM350-2 and try to count the pulses from the encoder.
This is nonsense.

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