What is the difference between DIO_HEALTH and RIO_HEALTH found in M580 Device DDT?

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Issue:

M580 DDT has the below elements, customer wants to know what the device differences
Customer believes that the DROP_HEALTH DDT corresponds to the BM•CRA312•0 drops (up to a maximum of 32 BM•CRA312•0 modules).

But what is the difference between the following. What are these monitoring?
1. RIO_HEALTH ARRAY [257...384] of BOOL RIO devices: One array element corresponds to one RIO device (up to a maximum of 128 RIO devices).
RIO stands for Remote IO

2. DIO_HEALTH ARRAY [513...640] of BOOL DIO devices: One array element corresponds to one DIO device (up to a maximum of 128 DIO devices).
DIO stands for Distributed IO

Product Line:
M580

Environment:
EcoStruxure Control Expert
Unity Pro

Resolution:

In a 'probable' future, we may have some Ethernet devices (not CRA drops) scanned by RIO scanner (ATV is a good example)
So we will have then the 3 different devices :

DROP = CRA
DIO (devices) = devices scanned by DIO scanner of the CPU / NOC for best effort communications
RIO (devices) = devices scanned by RIO scanner of the CPU for deterministic communications

DIOxRIO