Bently Nevada 3500/20 125744-02 Rack Interface Module (RIM)
Technical Specifications
– Input channels : 4 digital communication ports (Ethernet + serial)
– Sampling / update rate : 1 000 Hz per channel for real-time data streaming
– Resolution : 16 bits for configuration and event tagging
– On-board storage : 1 GB for event log, waveform buffer and firmware
– Communication protocols : Modbus/TCP, proprietary Bently protocol, RS-232/RS-485 @ 38.4 kbaud
– Power consumption : 4.75 W typical, powered directly from 3500 rack 24 Vdc back-plane
– Isolation : 1 500 Vac channel-to-ground, 500 V channel-to-channel
– Cable length : 2.1 m (7 ft) max for serial service lead
– MTBF : >250 000 h @ 45 °C per MIL-HDBK-217F
– Operating temperature : –20 °C to +70 °C full performance
– Storage temperature : –40 °C to +85 °C
– Humidity : 5 %–95 % non-condensing
– Shock / vibration : 15 g half-sine 11 ms; 2 g 5–500 Hz operational
– Dimensions : 75 mm × 95 mm × 25 mm (2.95″ × 3.74″ × 0.98″)
– Weight : 0.2 kg (0.44 lb)
– Agency approvals : CE, UL/cUL Class I Div 2, ATEX Zone 2, RoHS
– Slot-1 mandatory – every 3500 rack requires one RIM; occupies the first position adjacent to power supplies
– Dual-Ethernet option – copper and fiber ports support redundant plant networks and remote diagnostics rooms
– Auto-discovery – identifies and assigns addresses to every monitor module, eliminating manual DIP-switch setting
– Time sync – accepts IRIG-B or SNTP to timestamp events to ±1 ms across the entire rack
– Event historian – stores up to 50 000 system events and 1 000 alarm transient records locally
– Hot-pluggable – insertion/extraction under rack power without interrupting protection or process monitoring
– Firmware flash – field-upgradeable via Ethernet in <3 min without removing the module
– TMR ready – special TMR firmware performs 2-out-of-3 channel comparison when used in triple-modular-redundant racks
– Steam and gas turbine TSI cabinets – interfaces rack data to plant DCS and System 1 diagnostic servers in real time
– Offshore platform centrifugal compressors – redundant Ethernet rings send vibration and temperature data to onshore support centers
– LNG refrigeration trains – high-speed Modbus/TCP links provide machinery health data to DeltaV and Experion DCS
– Petrochemical ethylene crackers – local RS-232 port allows technician laptop connection during turnarounds without shutting down the rack
– Steel mill blast-furnace blowers – Zone 2 certification permits direct installation in hazardous junction boxes
– Pipeline pump stations – IRIG-B time synchronization aligns multiple racks along a 500 km right-of-way for accurate event sequencing
– Wind-turbine test cells – 1 000 Hz streaming rate captures transient torsional events during blade-pitch step tests
Slides into slot 1 of any 3500 rack; captive screws provide chassis earth bond. Dual front LEDs indicate module healthy, network activity and serial traffic. RJ-45 and DB-9 front connectors accept standard Cat-5e and RS-232 cables; no separate power wiring is required. Predictive fan-life and temperature data from the rack are accessible via the same Ethernet link, enabling remote health dashboards. Module replacement takes <1 min with no configuration recovery needed because all rack parameters are stored non-volatilely on every monitor.
Backward- and forward-compatible with all 3500 monitors (3500/40M, 3500/42M, 3500/44M, 3500/45, 3500/46M, 3500/50, 3500/60, 3500/62, 3500/70M, 3500/72M, 3500/77M, 3500/90, 3500/92, 3500/93). Works with legacy TDIX, DDIX and current TDI communication processors. Supports System 1 v6.5 and later, as well as third-party OPC, Modbus and DNP3 clients.
3500/20-01-02-00 125744-02 – Standard RIM, copper Ethernet, RS-232, conformal coat
3500/20-01-03-00 125744-02 – As above plus fiber-optic Ethernet port
3500/20-AXX-BXX-CXX – Full modular option table for cable length, firmware and certification variants
MAECENAS IACULIS
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- Protection: Overload, short-circuit, and overvoltage protection.
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