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The effects of Foundation Fieldbus (FF) H1 networks on the dynamic performance of steam generator level control (SGLC) loops are evaluated through two experimental setups using a DeltaV Distributed Control System (DCS). The first uses a physical system resembling a steam generator; the second is a hardware-in-the-loop (HIL) simulation with a steam generator model inside an industrial-grade nuclear power plant training simulator. The test results indicate that for a given control loop a longer FF H1 macrocycle will lead to more serious performance degradation. Furthermore, the effects of the networks are found to be mainly due to network-induced delays. Through the timing analysis of an FF-H1-network-based loop, delay models are developed, and suggestions to potentially reduce the delays and their impact are provided.