RIO01

[Swiss-Toni]

I have noticed with RIO01 it does not have a OP1 board and wonder what protection it has or what part would be replaced instead of the OP1 if it Burns out!

[slychiu]

The RIO outputs have resetable fuse protection as well as Overvoltage protection

There is no OP1 plug in. 

The plug-in OP1 is needed for Comfort and Slave and LEMs so that if the outputs are damaged, the security system need not be affected. If not for the OP1, the whole board would need to be changed, but with OP1 it can be unolugged and security system is not affected
In the case of RIO it does not affect the security, and the RIO can be replaced easily with very little cost. For RIO the main function is in the outputs so it is better than  the RIO be replaced when outputs are damaged