Are the commons on the AlphaStep inputs & outputs on the same node, i.e., is there a possibility of grounding loops occurring?

The common grounds for the AlphaStep inputs & outputs (Pins 2, 14, 16, 24) are all on the node, so that regardless of which voltage you use (5V or up to 30V), you have the same DC ground. The cathodes for the inputs & outputs (Pins 10, 12, 22, 32, 34 on the inputs and pins 24, 26, 30 on the outputs), however, are not on the same node since it relies on the grounding on the customer’s side. Our driver relies on photocoupled signals.