Any 984 programmable controller that supports the S908 RIO network can employ 800_series I/O at any or all of its remote drops, and any remote drop of 800_series I/O can use a J890 or J892 as the drop interface module.

The J890/J892 Interface modules are compatible with all 800 series I/O modules used in a S908 RIO network and may support up to 1024 input and 1024 output bits in a drop (depending on the capability of the head-end controller).

A J890/J892 Interface is a 1.5 slot module designed to be installed in the two slots immediately to the right of the primary power supply in the primary housing of a drop. The Interface sends data to and receives data from the 800 series I/O via the drop’s backplane; it communicates with the RIO processing unit in the controller via the RIO cable system.

In addition to managing the I/O data flow within the drop and over the RIO network, a J890/J892 is also used to define the address of the drop on the RIO network. Each module is equipped with a set of DIP switches with which you can set a unique drop address. The J982 also provides a second set of DIP switches for specifying ASCII device addresses. The locations of the switch packs and their addressing scheme are defined in P890 and P892 Switch Settings for the Drop Address and J892 DIP Switch Settings for ASCII Devices.