Are M M1 and M2 in AM2 AQ connected together?

Good afternoon,

I'm working on a Logo! series 8 24 VDC that drives 2...10 V damper actuators made by Belimo, powered by 24 VAC. During the commissioning I experienced the following: the actuator didn't follow the analog output of the AM2 AQ unit.

I asked the electrician to interconnect the 0 V terminal of the 24 VAC transformer with the M terminal of the 24 VDC of the Logo! and, as expected, the problem was solved.

But... I'm interested to know what's the electrical relatioship among the M (supply), M1 and M2 (references for U1+ and U2+). Are they internally connected by a common rail?

Thank you in advance.

Alberto

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<snip>
what's the electrical relatioship among the M (supply), M1 and M2 (references for U1+ and U2+). Are they internally connected by a common rail?
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I am confused.. was the customer's question answered?

UNRELATED (?)

LOGO! Support

<snip>
OK, I never heard of any 2..10V part. As nobody else answered I assume this is very exotic.
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..and why are we hung up about the 2 - 10V range?
This does not have any bearing on the question -- does it?
(Yes, the 0 - 1V of the range is not used.)

And I have used equipment supplied by Festo that uses that range. That same equipment is available in 4-20mA and 1 - 5V variants also. 2 - 10V is not that exotic.