CPU 314C 2PN/DP, stepper motor positioning control

HI EVERYONE,

                    I AM USING CPU 314C 2PN/DP, THROUGH WHICH I WANT TO RUN STEPPER MOTOR (BY DO OF CPU AS ITS 0 TO 3), MY APPLICATION IS TO GIVE DESIRED PULSES & IT WILL RUN TILL END OF PULSES.....& ALONG WITH THIS I WANT TO CONTROL ITS DIRECTION TOO....WE ARE NOT USING ENCODER FOR FEEDBACK

SO I REFERRED SIMATIC S7-300 CPU 31xC Technological Functions  MANUAL & USED SFB 49 WHICH IS FOR PWM. BUT UNFORTUNATELY MY STEPPER DRIVER IS NOT RUN WITH PWM & ITS FOR PTO. SO WE DECIDED TO CHANGE THE DRIVER & TO TAKE PWM DRIVER( PLS SUGGEST IF MY DECISION OR CONSIDERATION IS WRONG).

                    1. NOW MY QUESTION IS CAN SFB49 BE USED FOR MY APPLICATION??( WITH DIRECTION CONTROL__ FWD & REV )  

2.  DO I REQUIRE ENCODER FOR SFB 49 ??

3. DO I WANT TO BUY FM MODULE???????????

PLS HELP.. ITS URGENT...

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Split from position control with CPU 313C.

Ayman Elotaify

abbot131

According to the mannual I am not sure if I can use SFB 49 to create PWM ? Please give me some examples of SFB 49 . For S7 -200 I can use PWM function but S7 -300 I do not know how to do this . I have no experience about S7-300 Please describe me clearly and give me some example . Thank you so much.

Hello,

I hope this example will help you. You can download example from this link:

Using the integrated function "Pulse-width Modulation" of the S7 CPU 31xC

Hope this helps

 hi, i am also using 314c 2PN/DP for stepper application .. i am using DO on cpu for my application i dont want to use FM modules...  my application is to give only desired pulses & motor will strt till pulses....

i gone through the programming link but i used SFB 49 in block(as in attached pic),... now the output is coming on but motor is not rotating so pls suggest anythng...

further my question is SFB 49 can be used for fwd/ reverse applications????(i am not using encoder for feedback.. )