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  • OP4520-IO-PCIe: uses a PCIe link to communicate with the real-time computer.
  • OP4520-IO-REMOTE: uses one SFP socket configured with OPAL-RT’s MUlti-System Expansion (MuSE) link to communicate with the real-time computer.


  • PCIe connection uses point-to-point standard PCIe interface between the simulator and the expansion unit, similar to other OPAL-RT I/O expansion units (OP5600-IO, OP7000, OP5607, OP7020).
  • SFP connection allows high-speed communication (up to 5 Gbps) between the unit’s FPGA module and an external device. This mode can be used either for OPAL-RT MUlti-system Expansion (MuSE)communication (connected to a high-speed link compatible real-time simulator) or standard Aurora-based communication between any two units (either OPAL-RT or another third-party manufacturer). The FPGA bitstreams must be prepared for each FPGA module using either the MuSE (see note) option or the Generic Aurora block provided in OPAL-RT’s RT-XSG toolbox.
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NOTE: Restrictions to using MuSE with OPAL-RT board software architecture may apply depending on your application and software configuration. Please contact your sales representative or field application engineer to verify compatibility.

System Architecture

The following image illustrates the unit’s architecture for each option using assembly views of the simulation hardware components within the OP4520 chassis. The OP4520 contains an FPGA carrier, which can accept four standard OPAL-RT mezzanine boards, and an additional (optional) module that provide 12 RS422 or optical fiber channels.