Bently Nevada 125744-01 3500/20 | Rack Interface Module

The Bently Nevada 125744-01 3500/20 rack interface module manages communication between the 3500 rack and external host systems. This module serves as the primary data gateway for vibration and process monitoring data. The unit provides both local and remote access for system configuration and diagnostics.

Technical Specifications

Parameter	Specification
Product Type	Rack Interface Module (RIM)
Model	3500/20
Compatibility	Bently Nevada 3500 system
Communication Ports	2 x RS-232/RS-485 (configurable)
Data Transfer Rate	1200 bps – 115.2 kbps
Protocols	Modbus, proprietary Bently protocols
Diagnostic Features	Real-time status, event logging, self-test
Rack Management	Module configuration, health monitoring, alarm management
Dimensions (W x H x D)	241 x 152 x 25 mm
Weight	0.8 kg
Internal Components	1 x processor, 2 x UARTs, 1 x Ethernet controller (optional)
Connector Type	25-pin D-sub (female), RJ45 (optional)
LED Indicators	4 x status LEDs (power, communication, fault)
Power Supply	24V DC (from backplane)
Power Consumption	4W (typical)
Operating Temperature	-20°C to +65°C
Storage Temperature	-40°C to +85°C
Protection Class	IP20
Mounting	3500 rack (plug-in)
Approvals	CE, UL, CSA, ATEX

Primary Data Gateway for 3500 Systems

The Bently Nevada 125744-01 3500/20 functions as the primary data gateway for the 3500 monitoring rack. This module aggregates data from all monitoring modules in the rack. The unit formats and transmits data to external host systems. Users can access real-time vibration, position, and process data through this interface.

Dual Configurable Communication Ports

Two communication ports support RS-232 or RS-485 configuration for flexible integration. Users can connect to PLCs, DCS systems, and plant networks through these ports. The module supports both Modbus and proprietary Bently protocols. This versatility ensures compatibility with various host systems.

Comprehensive Rack Management Capabilities

The 3500/20 manages module configuration, health monitoring, and alarm management for the entire rack. Users can view module status, channel health, and system diagnostics through the interface. The module logs events and errors for maintenance planning. This management capability simplifies system administration and troubleshooting.

Real-Time Status and Diagnostic Monitoring

Four status LEDs provide immediate visual feedback on module and system operation. The power LED confirms proper supply to the rack interface module. Communication LEDs indicate active data transfer on each port. A fault LED alerts operators to rack or module errors requiring attention.

Seamless 3500 Rack Integration

The module plugs directly into the 3500 rack backplane for simple installation. A 25-pin D-sub connector provides field wiring for communication cables. Users can replace modules without system shutdown. The half-height design fits standard 3500 rack configurations efficiently.

Low Power Consumption for Reliable Operation

The Bently Nevada 125744-01 3500/20 draws only 4W for minimal heat generation. This low power consumption enhances system reliability and longevity. The unit operates reliably from -20°C to +65°C ambient temperatures. Users can deploy the module in various industrial environments without thermal concerns.