Greetings.

All I read is that pwm doesn't do that , doesn't do either,

because of frequency limitation.

So I wonder.

What appliances are built to work with the pwm function of logo?

I mean using the output of logo.

Finally, is there an extension, for logo, that can "correct" this limitation?

Hi,

The LOGO! PWM can be used after the PI function block to controll electrical heating, compressor, water pressure application.

Basically the max. output frequency of a LOGO! depends on the LOGO! cycle time. Any LOGO! program modification will influence the output frequency.

If you want to control a stepper drive for example, then a "real PLC" like SIMATIC S7-1200 should be used.

Here a link for an example how to get the LOGO! cycle time:

https://new.siemens.com/global/en/products/automation/systems/industrial/plc/logo/logo-application-examples.html

Hope this helps.

https://new.siemens.com/global/en/products/automation/systems/industrial/plc/logo/logo-application-examples.html

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