Operational Historian is replicated from the secured critical network to a replica Historian residing on the corporate or external network. Waterfall™ performs this replication by leveraging the Historian’s low level API in order to achieve maximum performance and real-time high throughput. Supported Historians today include the OSIsoft PI ™ Historian, GE’s Proficy Historian and others. The basic architecture for a Historian replication would look as follows:

Figure 4 – Basic Historian replication via Waterfall One-Way™

 Although all Historian data would be readily available to corporate users, external hackers cannot reach the operational Historian residing within the secure industrial network. Hackers may be able to impact the replica Historian, but the operational processes related to the critical operational Historian will continue unharmed.