AXC F 2152 bus connection AXL F BK PN TPS error

Hello Guys,

I have trouble establishing a working connection between an AXC F 2152 controller and an AXL F BK PN TPS**** bus coupler.
My setup is as follows:
Station 1: AXC F 2152 controller with AXC F XT ETH 1TX**-** PLC extension module and AXL F BP SE4**-** Module carrier. The module carrier has a AXL SE IOL4**-** Communication module, AXL SE DI16/1**-** Digital module and two covers.

LEDs:
BF-D → red
BF-D → red flashing
Run → green
D → green
EXT → green

Station 2: AXL F BK PN TPS Bus coupler with AXL F BP SE4**-** Module carrier. The modul carrier has a AXL SE IOL4**-** Communication module, AXL SE DI16/1**-** Digital module and two covers.

BF → red flashing
RDY → green
D → green flashing

I can ping the controller as well as the bus coupler from my PC.
I can find both modules in PLCnext Engineer via the online search.
I can load a program, no problem.
I can even use the “read profinet modules” button and it shows the right modules.

So there seems to be a connection. However it does not work.

Interestingly the LEDs D1-D4 on the module carrier that is connected to the controller keep flashing green. I don’t know if it is connected to the other problem or just a coincidence.

In the WBM the controllers shows under Device List the error “No connection (0x0023)”

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I hope you can help me.
If you need more information i am happy to provide it.

Best wishes,
Malte