The addressing format is going to be like it’s specified in the Ignition user manual: inductiveautomation.com/support/ … ssing2.htm
You’ll also have to make sure the NodeId is in namespace index 1, and you prefix the above Siemens address with “[DEVICE_NAME_IN_IGNITION]”.
So, for example:
[MyS7300]IB0
[MyS7300]DB1,DI8
etc…