Well. To reply to the rest of your topic: I don’t know why ts1 said you shouldn’t use the 24V of SI. As you said yourself, the 24V terminals are the same everywhere in the controller. 
What happens when you connect the device to the safeguard inputs? It should work.
Have you remembered to remove the Reset Safeguard inputs from CI0 and CI1 in Installation → Safety → IO? If this is not removed, the robot will not reset safeguard without a reset signal on CI0 and CI1.