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- Bently Nevada
- 3500/20 125744-02+135031-01
- Rack Interface Module
- USA
- 241.3 mm × 24.4 mm × 241.8 mm
- 1.5kg
- Xiamen, China
- New & In Stock
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Product Overview
The Bently Nevada 3500/20 125744‑02 is a Rack Interface Module (RIM) for the 3500 machinery protection system. It functions as the communication gateway of the rack, handling configuration, diagnostics, and external communication. The 135031‑01 is a companion I/O (input/output) module for the RIM, providing extended interface capabilities — e.g. modem interface, digital/analog I/O, and external connection to host systems.
When used together, the 125744‑02 (RIM) and 135031‑01 (I/O Module) combination forms the backbone of the rack’s external communications and control interface. The RIM must reside in slot 1 of the rack, while the I/O module occupies an associated rear slot to provide communication and signaling services.
Technical Specifications
Below are consolidated known or commonly cited specifications for 125744‑02 and 135031‑01. Some values are from product listings and may vary slightly depending on revision or firmware.
| Parameter | 125744‑02 (Rack Interface Module) | 135031‑01 (RIM I/O Module) |
|---|---|---|
| Model / Module | 3500/20 125744‑02 | 3500/20 135031‑01 |
| Module Type / Role | Rack Interface Module (RIM) — communication and control hub | I/O module for RIM — modem, digital/analog interface |
| Power / Consumption | ~ 4.75 W (typical) | ~ 3.5 W (typical) |
| Operating Voltage | 24 V DC nominal (typical) | 18–32 V DC range (for I/O module) |
| Operating Temperature | –30 °C to +65 °C (RIM operating) | –40 °C to +70 °C (I/O module) |
| Storage Temperature | –40 °C to +85 °C | –40 °C to +85 °C |
| Humidity / Environment | 95% RH non‑condensing | 0–95% RH non‑condensing |
| Communication Speed / Baud | 38.4 k baud (serial) | Matching protocol to RIM / modem interface |
| Cable / Communication Limits | RS232 front panel up to 30 m, RS422 up to 1200 m, RIM‑rack up to 1200 m | Modem / I/O link limits (e.g. 2.1 m cable for modem) |
| Dimensions (HxWxD) | 241.3 mm × 24.4 mm × 241.8 mm | 241.3 mm × 24.4 mm × 99.1 mm |
| Weight | 0.91 kg | 0.45 kg |
Notes:
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The RIM module (125744‑02) is full height / front slot module, with a large footprint in depth.
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The I/O module 135031‑01 is shorter in depth (99.1 mm) and lighter.
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Communication modes include RS‑232, RS‑422, modem interface, and rack bus.
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Environmental specs (temperature, humidity) apply to industrial settings.
Features & Advantages
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Central Communication Hub: The RIM centralizes all rack communications to external systems (host PCs, DCS, data loggers).
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Protocol Support & Flexibility: Supports Bently proprietary protocol, Hayes‑compatible modem protocols, RS‑232/RS‑422 modes, enabling flexible connectivity.
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High Data Reliability: The RIM ensures data integrity and fault management; supports fault relays to indicate rack health.
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Modular & Expandable: With the companion 135031‑01 I/O module, it extends external interface capability without modifying core monitoring modules.
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Redundancy / Diagnostics Support: In triple modular redundant (TMR) configurations, the RIM can compare channels and flag anomalies.
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Compact Yet Robust: Despite the high functionality, it remains built to the rack module standard and tolerates industrial temperature and humidity.
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Low Power Draw: Typical power consumption under 5 W helps reduce thermal load in racks.
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Field Serviceability: Modules can be swapped or upgraded with minimal downtime.
Applications
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Process and power plants where machinery condition monitoring racks need communication with control systems.
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Industrial facilities with remote diagnostics needs, where the I/O module provides modem or external data link.
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Situations requiring interface to SCADA, DCS, or plant historians.
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Systems needing fault signaling, remote reset, or trouble reporting from the rack to external systems.
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Configuration and calibration of rack modules via external host links.
Brand & Series
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Brand: Bently Nevada
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Series: 3500 System, Module Family 3500/20 (Rack Interface class)
Related / Similar Models in the 3500 Series
Here are five other models in the 3500/20 or associated rack interface / communication families:
| Model | Role / Description | Key Specs (abbreviated) |
|---|---|---|
| 3500/20 125744‑01 | TMR version of RIM (Triple Modular Redundant) | Same communication, higher fault‑tolerance |
| 3500/20 125768‑01 | RIM I/O module with RS232 / RS422 interface | Extended I/O interface to host, analogous to 135031 |
| 3500/20 125760‑01 | Data Manager I/O Module | Provides local data buffering and I/O for RIM |
| 3500/22 138607‑01 | Transient Data Interface Module (TDIX) | Handles high-speed streaming of waveform data |
| 3500/22M 288055‑01 | Standard Dynamic Data Interface (DDIX) | Lightweight streaming interface for rack data |
Popular Models from the Same Brand (Bently Nevada / Monitoring Systems)
Here are five widely known Bently / machinery protection modules:
| Model | Function / Description | Key Parameter / Range |
|---|---|---|
| 3300/16 330850-50-CN | Vibration monitoring / signal module | 1 Hz to 20 kHz range, multi-axis sensing |
| 3300/12 102566-02 | Proximity / gap sensor interface | High stability displacement measurement |
| 3300/20 88984-01 | Speed / tachometer sensing card | RPM signal processing capability |
| 3300/25 84933-02 | Temperature monitoring module | Ambient to high-temperature sensor interface |
| 3300/30 135813-01 | Displacement monitoring system | High-resolution displacement or position measurement |
FAQ (10 Q&A)
Q1: What is the primary role of module 125744‑02 in the 3500 system?
A1: It serves as the Rack Interface Module (RIM), the communication and control hub for the 3500 rack, connecting rack internals to external systems.
Q2: How does module 135031‑01 support the RIM?
A2: The 135031‑01 is an I/O expansion module that attaches to the RIM to provide additional external interface capability (modem, digital/analog channels, signaling).
Q3: What is the typical power consumption of 125744‑02?
A3: The typical consumption is about 4.75 W.
Q4: What environmental temperature range can 125744‑02 operate in?
A4: It can operate reliably from –30 °C to +65 °C.
Q5: What are the communication speeds / limits of the RIM?
A5: The RIM supports up to 38.4 k baud on the front panel serial interface; RS422 links up to long cable distances; internal rack bus also supports long runs.
Q6: How long can the modem cable be for the I/O module?
A6: The modem or I/O cable length is limited to about 2.1 meters (7 feet).
Q7: What are the physical dimensions of RIM and I/O modules?
A7: RIM: 241.3 mm × 24.4 mm × 241.8 mm; I/O: 241.3 mm × 24.4 mm × 99.1 mm.
Q8: What are their weights?
A8: RIM weighs ~0.91 kg; I/O module (135031‑01) weighs ~0.45 kg.
Q9: Can you replace or upgrade the RIM / I/O while the rack is live?
A9: In many installations, with care and proper procedure, module replacement is feasible with minimal disruption, though external communications may momentarily drop.
Q10: In what kinds of plants is this module combination used?
A10: It is used in power plants, petrochemical and refining, oil & gas platforms, and any facility using 3500 racks for condition monitoring requiring external communications and signaling.
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