Allen-Bradley 1757-FFLDC2 ProcessLogix Foundation Fieldbus Linking Device

The 1757-FFLDC2 is a high-performance Foundation Fieldbus H1 linking device developed by Allen-Bradley for ProcessLogix and ControlLogix architectures. Operating as a gateway between high-speed industrial networks and field instruments, this module bridges ControlNet communication networks to two independent Foundation Fieldbus H1 segments. It delivers centralized configuration, seamless signal translation, and real-time process data integration for large-scale distributed control systems.

Dual H1 Segment Gateway Infrastructure

Equipped with two independent H1 Foundation Fieldbus ports, the module manages up to 32 field instruments (up to 16 devices per H1 segment) operating at a standard 31.25 kbit/s bus speed. Functioning as a Link Active Scheduler (LAS) on each segment, it controls bus communications and executes deterministic timing to ensure uninterrupted process loops and reliable transmitter feedback.

Network Bridging and System Integration

The device bridges field-level H1 segments to higher-level automation controllers over ControlNet (C-Net). Through this gateway architecture, process engineers can configure field devices, run fieldbus function blocks, and continuously stream process diagnostics into ProcessLogix control systems using standard RSLogix 5000 / Studio 5000 software tools.

Technical Parameters

Frequently Asked Questions

Q: What function does the 1757-FFLDC2 perform in a DCS architecture? A: It acts as a network gateway connecting ControlNet to two Foundation Fieldbus H1 field segments, allowing higher-level controllers to monitor and configure field instrumentation seamlessly.

Q: How many Foundation Fieldbus instruments can be connected to a single 1757-FFLDC2? A: The module supports up to 32 Foundation Fieldbus H1 field devices across its two embedded channels, with a limit of 16 devices per H1 segment.