Hello,

I am trying to use a Logo! to control some stepper motors for damper control in a HVAC system. I have been able to get the Logo to control the motors by using the PWM block to send the pulses to the stepper motor controller and am using a proximity sensor as a switch to detect the half rotations. I currently have the PWM block set at the .01 second option which is the lowest it will allow, which currently gives 2 seconds/rotation on my stepper motor. The image attached shows the current program, although I need to make the pulses half the time so the motor can complete a full rotation of 200 steps in 1 second. I was under the impression I needed to use the PWM block to allow for the pulses to be sent although someone else may be able to help me find another way.

According to the manual the maximum switching rate of the outputs is dependent on the program cycle length.  I was wondering if anyone could help me in figuring out how to send faster pulses to the stepper motor controller.

Thank you in advance for the help.

Closed cause question posted twice.

The second thread with the subject Using NC proximity switch to turn off motors is published within the conference LOGO! - Software.

Best regards,
Jen_Moderator