Parallel Redundancy Protocol (PRP) & Highly-available Seamless Redundancy (HSR) are both supported by Brodersen PLC/RTU series. It is plug & Play. IEC 62439-3 Clause 4 (Parallel Redundancy Protocol, or PRP), and IEC 62439-3 Clause 5 (High-availability Seamless Redundancy, or HSR), are standardized redundancy protocols for industrial automation networks that require