Reducing 24V output to 5V for FM Stepdrive

Duris_I

Hello, probably these are Negative signals, I think.

Edit: reverse?

 Hi!

In the FM-353 doc these signals are true and negated.

See the attachment from this doc about the wiring.

Thank you Kahl!

I contacted with the German Support and got an information that the inputs require differential signal to control the motor - it's even shown in the file included by Kahl. That explains why my circuit doesn't work in this case.

I have two options then - make another circuit for sending differential signals or simply use one of modules meant to cooperate with FM Stepdrive (FM353 with S7-300 or 1-STEP-DRIVE with ET200S). It's bad solution for me because it increases cost and size of the whole instalation.

Hi!

You could try the third option from fig 4-3.

Excuse me for such a late answer. I tried that circuit and it, unfortunately, didn't work. When I connected the cables from FM Stepdrives to the circuit, it didn't even get the voltage signals (I placed some LEDs there to know when the signal appears). When I disconnected them and was only sending signals from PLC, the LEDs were working so signals appeared.

I kind of gave up in this case and I'm currently trying to commission the motor with 1PULSE 5V/204kHz module for ET 200S, maybe this solution will work.