The Bently Nevada 3500/22 is a Rack Interface I/O Module (RIM I/O) for the 3500 Series Machinery Protection System. It operates in conjunction with the 3500/20 Rack Interface Module (RIM) and provides the primary communication interface between the 3500 rack and higher-level host systems.

The module supports RS-232 and RS-422 communication, enabling reliable data exchange between the 3500 rack and an upper-level computer or communication processor, such as TDXnet. As a core communication component of traditional rotating machinery condition monitoring systems, the 3500/22 is widely used in vibration and displacement monitoring applications across industries including petrochemical, power generation, and metallurgy.

Core Functions and Application Scenarios
Communication Bridge

Acts as the central communication interface between the 3500 rack and the host computer, enabling bidirectional transmission of system data. This includes static information such as alarm states, configuration parameters, and system status data.

Mode Control and System Security

Equipped with a front-panel key switch that allows selection between Operating and Program modes. This feature prevents unauthorized or accidental configuration changes, ensuring stable and reliable system operation.

Rack Chain Expansion

Supports daisy-chain connections of multiple 3500 racks, enabling scalable and distributed monitoring architectures. This makes it suitable for centralized monitoring systems covering multiple machines or units, such as compressor or turbine trains.

Typical Applications

Commonly used in rotating machinery protection and condition monitoring systems, including:

Steam turbine generators

Centrifugal compressors

Large electric motors

Integrated vibration, displacement, and speed monitoring systems

BENTLY 3500/22 161580-01 TXI I/O Module