7I37 installation

I have a system running with an 7I96 and want to have additional I/O from the 7I37.
I have the 7I37 with 8 outputs and 16 inputs.
The board is connected with 5V from P1 and the Jumper is in the lower position.
I have 24V in out0- and a relay on out0+.
The Relay is always on, so 24V are supplied to the relay. 
This doesn't change if the board is powered or not.
The state of the mosfet doesn't change if i supply GND or 5V to the anything IO Pin 33 (Pin corresponded to OUT0).
If I measure all the pins 1-47 vs GND (only odd ons) they have 3.28V.

Any Hint would be appreciated. 

Thanks
Andreas

if you connected 7I37 OUT0- to +24V, you have the MOSFET output polarity
backwards so it will appear to be stuck on

(because of the inherent source drain diode in the the MOSFET)