Product Description:

The R-IB IL AI 2/SF is an analog input interface module produced by Bosch Rexroth Indramat for the R-IB Interface Modules series. Installed on a remote I/O rail, it converts field-level current or voltage signals into digital data that a PLC can process. By integrating this module, process variables such as pressure, flow, or temperature are sampled and forwarded on the back-plane bus, allowing centralized control equipment to supervise distributed sensors without running shielded analog cables back to the cabinet.

In operation the module provides 2 analog inputs, each selectable for 0–20 mA or ±10 V ranges. An internal converter digitizes every channel in 120 µs, so a full two-channel scan completes in under a quarter millisecond. Input fidelity is maintained by a 90 dB minimum common-mode rejection ratio that suppresses ground noise between field wiring and logic. Field electronics are fed from the back-plane at 24 V DC, drawing only 12 mA on the I/O supply and 45 mA on the logic rail. Total thermal loading remains low with a typical dissipation of 625 mW, simplifying enclosure ventilation. The front end presents 50 Ω to current sources and at least 220 kΩ to voltage sources, so transducers see predictable loading. A single-pole digital filter with a 230 Hz cut-off removes high-frequency interference before conversion. The housing carries an IP20 protection rating.

Process data are packed into 2 words and transferred across the local bus at up to 500 kbps, matching the cycle times of mid-range PLCs. The segment controller supplies a separate 7.5 V DC communications rail that powers the transceiver section without affecting sensor excitation. Each measurement delivered to the bus is a moving average of 16 successive conversions, reducing random noise while maintaining real-time responsiveness. Despite its signal conditioning functions, the module weighs only 68 g, so it adds negligible mass to DIN-rail assemblies and places minimal stress on field wiring.