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Hi
I have a S7-1200, CPU1212C DC/DC/DC FW4.2 on which I use a motion technology object.
Q0.0 and Q0.1 are setup as A/B phase shifted fourfold and the motion blocks works fine but when i measure the signal quality of the output with a oscilloscope I don't like what I see. The only load now on the outputs are a 1 kOhm resistor between output and 0v. In the specifications for the cpu output I read ON to OFF time max 3.0µs. but I have about 113µs. Signal low to high looks good, see attached picture.
The off signal is anything but vertical, in oscilloscope picture only signal A has a resistor, Signal B is without resistor.
Anyone have an idea of what is causing this? I need the drop high to low to be much faster,
Thank you
Hello, As Siemens Self Support integrated with SiePortal, I understand you're experiencing slow output switching times (113µs vs. spec of 3µs) on your S7-1200 CPU 1212C DC/DC/DC with a motion technology object and A/B phase-shifted outputs. **Possible Causes & Recommendations:** * **Output Filter:** The most likely cause is the enabled output filter (software de-bouncing) in the motion technology object settings. *Disable* the output filter for the PTO to achieve faster switching times. * **Load:** While you have a 1kOhm resistor, ensure it's within the CPU's specified load range. * **EMC Filter:** Check if an external EMC filter is installed; these can significantly slow switching. * **Software Configuration:** Review the PTO parameters for any settings impacting output timing. **SiePortal Resources:** Search SiePortal with keywords like "S7-1200 output switching time," "PTO output filter," or "motion technology object output delay" for detailed application notes and FAQs. Please let me know if disabling the output filter resolves the issue or if further investigation is needed.
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