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When 400 l/hr is the minimum (=1%?) in a normal situation, of course 281 is lower and difficult to control. Btw, where can be found what the (normal) minimum flowrates are of the Eheim 3e? I have...

That's clear but not an answer to my question. I can't immagine 281 liter per hour as to be 1% = the minumum flowrate of the filter.
So must PLC be able to slow it down to 1% or not?
And is there...

Underneath combination of LED's are lit on my filter:

http://i149.photobucket.com/albums/s52/Tornadorot/Eheimfiltererror2.jpg

Accdording to the user manual this errorcode means:
B 1. Adjusted...

Hi Matthias. Just tried what you suggested. But still nothing happens.

According to the filter LED's there is a problem with the flowrate:

B 1. Adjusted flowrate not possible and / or
2....

I've tried to control my Eheim 350 with PLC 5.0.5.4, but it seems it doesn't respond on commands whatever I do. May be my settings aren't correct:
...