The NI 9145 is a replacement for the NI 9144 and the core functionalities and the appearance remain the same.
However, with upgrading the hardware, you will get the performance improvement mentioned below with the NI 9145:
PDO (Process Data Object) size improvement
|EtherCAT Chassis||PDO Input||PDO Output|
|NI 9144||512 Bytes||512 Bytes|
|NI 9145||7500 Bytes||7500 Bytes|
HSI (High Speed Interface) module support
The NI 9144 only support HSI modules on the first 4 slots; however, the NI 9145 can support HSI modules on all 8 slots.
|EtherCAT Chassis||HSI Support|
|NI 9144||Slot 1-4|
|NI 9145||Slot 1-8|