Foxboro P0922YU I/A Series Fieldbus Termination Interface Module

Technical Specifications Bus Interface Type: I/A Series 2 Mbps fieldbus trunk termination interface Communication Rate: 2 Mbps HDLC fieldbus Built‑in Termination Resistor: 120 Ω bus matching resistor, configurable switch Transient Surge Suppression: 1500 V Operating Power Supply: 24 VDC from system backplane bus Operating Temperature: ‑40 ℃ to +70 ℃ Storage Temperature: ‑50 ℃ to +85 ℃ Relative Humidity: 5%‑95%, non‑condensing Mechanical Dimension: Standard single‑slot plug‑in module for Foxboro I/A Series rack Certifications: CE, UL, ATEX, IEC 61508 functional safety compliance

Functional Features Provides physical termination and impedance matching function for I/A Series fieldbus trunk line. Configurable built‑in bus termination resistor via hardware switch. Multi‑branch bus signal distribution for multiple FBM I/O modules. Hardware surge suppression for restraining bus line transient interference. Built‑in self‑diagnosis for bus signal abnormality, power supply and internal circuit faults. Supports hot‑swap operation under system running condition.

Application Scenarios Process industry distributed control system(DCS). Multi‑I/O slot DCS rack fieldbus trunk termination. Petrochemical plant large‑scale I/O rack bus signal matching processing. Oil & gas site multi‑FBM module integrated cabinet bus interface.

Structural Characteristics Standard single‑slot plug‑in structure matching Foxboro I/A Series rack. Front panel equipped with status LED indicators for power supply, bus active and bus fault. Hardware toggle switch for switching built‑in termination resistor on/off. Backplane golden finger interface for docking with rack internal fieldbus circuit.

Working Principle Fieldbus trunk signal is connected to front‑side trunk terminal of P0922YU module. Built‑in configurable termination resistor completes bus impedance matching to eliminate signal reflection.

Installation Requirements Insert module into designated fieldbus termination slot of Foxboro I/A Series standard rack. Ensure rack ground connection strictly complies with official system grounding specification. Fieldbus wiring must adopt shielded twisted‑pair cables; separate bus cable and power cable routing to avoid crosstalk.