The 8520-ROPI is a Remote Operator Panel Interface Assembly manufactured by Allen-Bradley. This operator panel interface assembly makes all connections that are needed to establish a link between any 9/Series controller and a removable operator panel. It is practical to have the removable operator panel on applications where an interface is not needed often and you can use one remote panel to transport it from one control to another as necessary. This panel transfer functionality is made available over the 8520-ROPI. All the user has to do is install this operator panel interface assembly in the I/O ring. By doing this, the removable panel can be attached or removed from the 9/Series I/O ring without physically violating the I/O ring. For this purpose, installation of the 8520-ROPI in the 9/Series I/O ring is needed wherever the user plans to make a connection with a removable operator panel. The 8520-ROPI interface assembly is a medium to make all of the connections between controllers form 9/Series and the removable operator panel. Each 8520-ROPI assembly must be provided with an exclusive node address on the I/O ring. The node address is adjusted by operating the jumpers (designated JP1 and JP2) positioned under the cover of the removable operator panel interface assembly.

This device has two connectors to join the I/O ring (RED – output, BLACK – input). It also has the video signal connector (CN19M 15-pin D-shell) for connecting this module to the boards 9/230, 9/260, or 9/290. The connection between the removable operator panel and the 850-ROPI is made via a cable, which goes from the CN5 connector to the 37-pin connector on the front of the removable operator panel (maximum 10 feet in length). The 8520-ROPI is supplied with AC power, which is distributed to HPGs and an MTB panel I/O module (5 Volts DC and 12 Volts DC) with overcurrent protection integrated. The 8520-ROPI weights approximately 5 kilograms and its housing dimensions are approximately 320 x 220 x 220 millimeters. This part is no longer manufactured by Allen-Bradley.