IEC 61499 allows one or multiple applications to be run on one resource/device or distributed to multiple resource/devices.

If an application is split and distributed to multiple resource/devices, all cross communications between the application’s FB’s on different resources/devices are automatically re-created & managed by the UAO runtime. This is what we mean by application interoperability – the ability to split connected FB’s in an application and have them interoperate across the different resource/devices to which they are distributed.