A/D in Siemens LOGO! Unstable result.

[Skogsgurra]

Hello,

I am about to investigate irregular behaviour in a 24 V LOGO! The system is said to get into what is perceived as self-sustained oscillations that results in an unstable result from the A/D - which in turn makes a temperature control loop go amok.

Before digging too deep into it, it would be interesting to hear if you have had any similar experience with this make or any other of these small "programmable relays".





Gunnar Englund

http://www.gke.org

 

[ozmosis]

Gunnar
Is this when using the AM2 extension module?
I've sent an email to you about an FAQ posted about various recommendations on reducing fluctuations into the analogue module for the LOGO!

 

[Skogsgurra]

Thanks Patrick,

This is I7 and I8. Must be the extension module, I think? As I said "I am about to" so I haven't seen the thing.

Gunnar Englund

http://www.gke.org