Product Overview
The Bently Nevada 3500/94 is a Display/Interface Module used within the 3500 Series rack-based machinery protection system. The 128240-01 is a specific configuration variant of this module, typically including the display and standard communication interfaces.
Unlike other 3500 modules (e.g., monitors, tachometers), the 3500/94 is not a measurement module. It serves as an operator interface and data gateway for the 3500 rack. It features a built-in backlit LCD display (typically 4 lines × 20 characters) and keypad, allowing local viewing of channel values, alarm status, and system health without requiring an external computer or DCS connection.
The 3500/94 also provides serial communication ports (RS-232, RS-422, RS-485) for connecting to distributed control systems (DCS), programmable logic controllers (PLC), or host software such as Bently Nevada's System 1®. The 128240-01 variant typically includes the display and the necessary firmware for standard Modbus protocol support.
Key Parameters (Table)
| Parameter | Specification / Value |
|---|---|
| Manufacturer | Bently Nevada (GE / Baker Hughes) |
| Model | 3500/94 |
| Part Number (Variant) | 128240-01 |
| Module Type | Display / Interface (Operator Interface) |
| Display | Backlit LCD, 4 lines × 20 characters |
| User Input | Integrated keypad (navigation and control) |
| Communication Ports | RS-232, RS-422, RS-485 (Modbus RTU protocol) |
| Supported Protocols | Modbus (master/slave), proprietary Bently Nevada protocols |
| Data Access | Real-time channel values, alarm status, system health, event lists |
| Rack Compatibility | 3500 Series (all rack versions) |
| Power Supply | Supplied via 3500 backplane (from 3500/15 Power Supply) |
| Operating Temperature | -30 °C to +65 °C (-22 °F to +149 °F) |
| Mounting Type | Rack-mounted (3500 series backplane) |
| Dimensions (Module) | Height: 241 mm (9.5 in) Width: 25.4 mm (1.0 in) – 1 slot wide Depth: 242 mm (9.5 in) |
| Weight (Module only) | Approx. 0.9 kg (2.0 lbs) |
| Typical Total Weight (with packaging) | Approx. 1.1 kg (2.4 lbs) |
*Note: The 3500/94 occupies one front slot. It does not require a separate rear I/O module for basic display and serial communication functions.*
Application Scenarios
The 3500/94 (128240-01) is used in machinery protection systems where local operator access to vibration, position, speed, and process variable data is required without relying on external systems.
Primary Applications:
Local Monitoring in Control Rooms
Mounted within a 3500 rack near the machine or in a local equipment room.
Allows operators to view real-time vibration amplitudes, thrust position, speed, and temperature directly on the module's display without opening a DCS or laptop.
Field Maintenance and Troubleshooting
Technicians can scroll through channels, check alarm setpoints, and verify OK/Not OK status on the spot.
Useful during startup/shutdown procedures where immediate visual feedback is needed.
Data Gateway to DCS / PLC
Provides Modbus RTU serial communication to transmit all monitored values to plant control systems.
Eliminates the need for dedicated communication processors for basic data integration.
Standalone Rack Interface (No Host Computer)
In small protection systems without a dedicated condition monitoring server, the 3500/94 acts as the primary user interface.
Operators can acknowledge alarms, view event logs, and check system configuration.
Backup Communication Path
Serves as a redundant or secondary data link when the primary Ethernet-based interface (e.g., 3500/92 Communication Gateway) is unavailable.
Provides basic but reliable access to critical machine data.
Typical 3500 Rack Configuration Example:
Slot 1: 3500/15 Power Supply
Slot 2: 3500/20 Rack Interface
Slot 3: 3500/42M Vibration Monitor
Slot 4: 3500/50 Tachometer Module
Slot 5: 3500/32M Relay Module
Slot 6: 3500/94 (128240-01) → for local display and Modbus serial output to DCS
Limitations (Important):
The 3500/94 does not perform any measurement or alarm function. It only displays and transmits data from other 3500 modules.
For high-speed data streaming (e.g., waveform, FFT), a 3500/92 Communication Gateway or System 1® software is required.
The display is character-based, not graphical. For graphical trends or orbits, external software is necessary.
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