Description
The BENTLY 3500/42M 140734-02 is a digital communication module manufactured by Bently Nevada(a Baker Hughes company),designed for use in the 3500 Machinery Protection System.This module provides robust Modbus RTU and Modbus TCP communication capabilities,enabling seamless integration between the 3500 monitoring system and external control systems such as DCS,PLCs,and SCADA platforms.It is commonly installed in the 3500/15 or 3500/25 chassis and serves as a critical data gateway for real-time vibration,displacement,and machine health information.
Application Scenarios
At a coal-fired power plant in Ohio,the main steam turbine’s 3500 monitoring system lost communication with the central DCS,triggering alarm silencing and loss of remote diagnostics.Diagnostics revealed a failed BENTLY 3500/42M 140734-02 module.A replacement unit was shipped overnight,installed the next morning,and reconfigured using saved settings.Communication was restored within 20 minutes—no firmware update or system reboot required.This incident highlighted the 3500/42M’s role as the vital link between machine protection and plant-wide automation,preventing potential operational blind spots.
Parameter
Main Parameters Value/Description
Product Model 3500/42M
Firmware Part Number 140734-02
Manufacturer Bently Nevada(Baker Hughes)
Product Category Digital Communication Module
Primary Function Modbus RTU and Modbus TCP communication gateway
Supported Protocols Modbus RTU(RS-485),Modbus TCP(Ethernet)
Interfaces 2×RS-485 ports,1×10/100 Mbps Ethernet port
Installation Slot Standard 3500 series chassis(e.g.,3500/15,3500/25)
Power Source Backplane-powered(from 3500 chassis)
Configuration Method Via 3500 Configuration Software(Turbine or Asset Suite)
Redundancy Support Yes–can be used in redundant pairs for high-availability systems
Environmental Rating Operating:-10°C to+60°C,5–95%RH non-condensing
Compliance CE,UL,CSA,FCC,RoHS
LED Indicators PWR(Power),RUN(Running),COM(Communication),ALM(Alarm)
Typical Applications Steam turbines,gas turbines,compressors,pumps,fans,generators
Technical Principles and Innovative Values
Innovation Point 1:Dual-Protocol Communication Gateway
The BENTLY 3500/42M 140734-02 uniquely supports both Modbus RTU(serial)and Modbus TCP(Ethernet),allowing it to interface with legacy DCS systems and modern Ethernet-based networks simultaneously.This dual-protocol capability ensures backward compatibility while enabling future-proof integration.
Innovation Point 2:Seamless Integration with 3500 System
As a native Bently Nevada module,the 3500/42M automatically synchronizes with other modules in the chassis(e.g.,vibration,temperature).It maps real-time process and alarm data into Modbus registers,enabling SCADA systems to read machine health status without complex programming or middleware.
Innovation Point 3:Hot-Swappable&Redundant Operation
Designed for continuous operation,the 3500/42M supports hot-swapping.In redundant configurations,two 3500/42M modules operate in master/standby mode—ensuring uninterrupted data flow even during module failure or maintenance.
Innovation Point 4:Deterministic Data Transmission
The module uses a deterministic polling engine to deliver data with minimal latency.Critical alarm and trip signals are prioritized,ensuring that protective actions are communicated instantly to the control system—essential for preventing catastrophic machinery failure.
Application Cases and Industry Value
In an offshore oil platform in the North Sea,a gas compressor train relies on the BENTLY 3500/42M 140734-02 to transmit vibration data to the central control room via Modbus TCP.During a storm,the primary 3500/42M failed due to power surge damage.The redundant secondary module took over instantly,maintaining monitoring and preventing a shutdown.The failed unit was replaced during the next maintenance window,demonstrating the module’s role in ensuring operational continuity in remote,high-risk environments.
Similarly,a paper mill in Sweden upgraded its legacy monitoring system by installing BENTLY 3500/42M 140734-02 modules in existing 3500/15 racks.This enabled integration with their new Siemens PCS7 DCS via Modbus TCP,eliminating the need for costly system replacement.The project delivered a 40%cost saving and reduced integration time by 60%.
Related Product Combination Solutions
3500/15:15-slot chassis that houses the BENTLY 3500/42M module.
3500/25:Alternative chassis model compatible with 3500/42M.
3500/22M or 3500/25:Power supply modules that provide backplane power to the 3500/42M.
3500/34:Proximitor module for vibration input,whose data is transmitted via the 3500/42M.
3500/33:Temperature input module,often monitored through the 3500/42M’s Modbus interface.
3500/85:Display module for local HMI,can coexist with 3500/42M in the same rack.
3500/92:Relay module for alarm outputs,typically supervised by the 3500/42M for remote status.
140734-01:Previous firmware version of the 3500/42M,largely compatible with 140734-02.
Installation,Maintenance,and Full-Cycle Support
To install the BENTLY 3500/42M 140734-02,simply insert it into an available slot in a powered 3500 chassis.Secure it with the front screws and connect RS-485 or Ethernet cables to the rear.Configuration is done via Bently Nevada’s 3500 Configuration Software,where Modbus register mapping,IP settings,and communication parameters are set.
Routine maintenance includes checking LED status,verifying network connectivity,and ensuring firmware compatibility during system upgrades.The module has no user-serviceable parts,but its solid-state design ensures long-term reliability.
We offer fully tested BENTLY 3500/42M 140734-02 modules,each verified for communication integrity and compatibility with 3500 systems.Every unit comes with an 18-month warranty,technical support,and configuration guidance.
