I. Basic Information

Model: 72351-03-04-02-01-01-01 (Part Number) = 3500/21 (Commercial Model)

Series: Bently Nevada 3500 Condition Monitoring System

Form: Full-height card, occupying one full-height slot in the 3500 frame (3500/22M is half-height)

Function Positioning: Frame Interface Module (RIM), the "communication center" of the 3500 frame

II. Model Code Analysis (72351-XX-XX-XX-XX-XX-XX)

According to the naming rules of the Bentley 3500 series, the breakdown of the meaning is as follows:

72351: Basic component number, fixedly representing 3500/21 RIM

-03: Hardware version / firmware version

-04: Communication interface configuration (such as RS232/RS422)

-02: Function option (such as whether it supports TMR redundancy)

-01: Region / language version (default English)

-01: Production batch / revision number

-01: Special customization code (standard configuration is 01)

III. Core Functions

Frame Communication Management: As the sole interface between the 3500 frame and the upper system, responsible for the data aggregation and command issuance of all modules (monitoring cards, power supplies, relays).

Configuration and Diagnosis: Provides RS232/RS422 serial ports, connects to the 3500 configuration software, to achieve frame configuration, parameter modification, and fault diagnosis.

External Communication Expansion: Connects to communication processors such as TDXnet, TDIX, DDIX, etc., supporting data interaction with System 1, DCS/SCADA systems.

System Status Monitoring: Displays running, communication, fault, configuration validity, etc. status through panel LED, and has a normal / fault signal output system for relays.

IV. Technical Parameters

Slot: One full-height slot in the 3500 frame (adjacent to the power supply on the right)

Communication Interface: Standard RS232 (38.4k baud rate), optional RS422

Power Consumption: Typical 4.75W

Redundancy: Supports TMR three-redundancy frame configuration

Environment: Operating 0–60℃, Storage -40–85℃

Size (H×W×D): Approximately 250 × 85 × 150 mm

Weight: Approximately 1.0 kg

V. Differences from 3500/22M (72358-51) Table

Project 72351-03-04-02-01-01-01 (3500/21) 72358-51 (3500/22M)

Form Full-height card (occupying 1 full-height slot) Semi-height card (occupying 1 semi-height slot)

Function Only RIM (basic communication) RIM + TDI (communication + transient data acquisition)

Interface Serial port (RS232/RS422) Ethernet (10/100Base-TX) + serial port

Data capability Only steady-state data Steady-state + transient (waveform, spectrum, phase)

Current status停产， only spare parts supply Active mainstream, recommended as a replacement for 3500/21

Six. Typical Applications and Alternatives

Application scenarios: Rotating machinery condition monitoring for old 3500 framework (full-height slot design) (steam turbine， compressor， fan， etc.).

Alternative solution： New project directly uses 3500/22M (72358-51)； spare parts of old equipment can be directly replaced， semi-height to full-height requires an adapter.

Seven. Common Combinations

3500/21 + 3500/40M (vibration monitoring)

3500/21 + 3500/42M (shaft displacement monitoring)

3500/21 + 3500/44M (temperature monitoring)