Bently Nevada · 3701/40 processing and sensor-input pair

Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 | 3701/40 Processor and PAS Input Modules

Name: Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 | 3701/40 Processor and PAS Input Modules
Brand: Bently Nevada
SKU: 2926051
Price: 1 USD
Availability: InStock

Processor and PASSignal conditioning to DSPSimplex or duplex

Product file3701/40177896-05 + 177988-01Processor and input-module functions

Product Information

Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 combines two distinct 3701/40 ADAPT hardware roles on one comparison page: 177896-05 is the processor module and 177988-01 is the Prox Accel Seismic input module. Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 forms a working signal path in which the PAS module conditions field-transducer signals and the processor digitizes those analog signals, calculates measurements, and evaluates alarm and logic functions.

Within Bently Nevada 3701/40 177896-05 / 3701/40 177988-01, the 177988-01 PAS provides six independently configurable measurement channels and a seventh Keyphasor or speed channel, while the 177896-05 processor supplies A/D conversion, digital signal processing, two RJ45 Ethernet ports, and communications with System 1, BNMC, Modbus TCP, and Ethernet Global Data. The two components in Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 are complementary and cannot substitute for one another.

A simplex 3701/40 arrangement uses one processor from Bently Nevada 3701/40 177896-05 / 3701/40 177988-01, whereas a duplex architecture uses two identically configured 177896-05 processors receiving the same conditioned inputs. Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 must be ordered by both complete part numbers because “3701/40 module” does not distinguish the CPU from the PAS front-end hardware.

Technical Data

Technical Item	3701/40 177896-05	3701/40 177988-01
Brand	Bently Nevada
Product Name	3701/40 Processor Module	3701/40 Prox Accel Seismic Input Module
Country	United States
System Family	3701/40 ADAPT Machinery Dynamics Monitor
Ordering Part Number	177896-05 = Processor Module	177988-01 = Prox Accel Seismic Input Module
Primary Role	A/D conversion, DSP, measurements, alarms, logic, communications	Field-sensor excitation and analog signal conditioning
Channel / Processing Structure	Processes conditioned signals from one or two installed input modules	6 configurable measurement channels plus channel 7 for Keyphasor or speed
External Interfaces	2 RJ45 Ethernet ports	Multi-pin D-sub buffered-output interface
Supported Inputs	Conditioned analog signals from supported 3701/40 input modules	Proximitor, accelerometer, Seismoprobe, inertial velocity, dynamic pressure; proximity or magnetic-pickup reference
Configuration and Communications	BNMC; System 1; Modbus TCP server; Ethernet Global Data	Per-channel sensor configuration; analog handoff to the processor
Simplex / Duplex Use	1 processor in simplex; 2 identically configured processors in duplex	One or two supported input modules according to monitor architecture
System Power	External +24 Vdc through the 3701/40 monitor
Signal Direction	Field transducer → PAS analog conditioning → processor A/D conversion and measurement processing
Diagnostics Boundary	Processor status, measurement, alarm, logic, and communication diagnostics	Diagnostic microcontroller remains outside the analog protection path

Processor and Input Module Cooperation

Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 divides sensor conditioning and digital processing between two dedicated modules so each stage performs a defined function.

01 · Accept

PAS sensor interface

The 177988-01 component of Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 powers or accepts the selected transducer and conditions each configured analog channel.

02 · Transfer

Analog handoff

Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 passes the conditioned PAS signals to the 177896-05 processor without treating the buffered test connection as the protection output.

03 · Process

Digital measurement path

The 177896-05 component of Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 digitizes the analog inputs, calculates measurements, evaluates alarms, and executes configured logic.

Simplex, Duplex, and Sensor Integration

Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 supports different monitor architectures by combining the required processor quantity with the appropriate PAS channel population and network connections.

Choose one or two CPUs

Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 uses one 177896-05 processor for simplex operation or two identically configured processors for duplex operation.

Assign the seven PAS inputs

Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 reserves PAS channels 1 through 6 for supported measurement transducers and channel 7 for the Keyphasor or speed reference.

Link monitoring software

The processor side of Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 connects BNMC, System 1, Modbus TCP, or Ethernet Global Data through its two RJ45 interfaces.

Product Questions

Why must Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 be ordered as two separate part numbers?

Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 names a processor module and a PAS input module with different hardware functions. Order 177896-05 for processing and communications and 177988-01 for sensor conditioning; one part of Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 cannot perform the other part’s role.

What should be checked when sensors are wired to Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 but no measurements appear?

For Bently Nevada 3701/40 177896-05 / 3701/40 177988-01, first confirm the 177988-01 channel type, field power, polarity, and analog conditioning, then confirm the 177896-05 processor configuration and input-module assignment. A healthy PAS signal still needs the matching processor configuration before Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 can publish a measurement.

How is the processor quantity determined for Bently Nevada 3701/40 177896-05 / 3701/40 177988-01?

A simplex installation of Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 uses one 177896-05 processor, while a duplex installation uses two identically configured processors. Confirm the terminal base and required redundancy before ordering the processor quantity for Bently Nevada 3701/40 177896-05 / 3701/40 177988-01.

Can channel 7 of Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 be used as another vibration channel?

Channel 7 on the 177988-01 side of Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 is dedicated to a Keyphasor or speed reference from a proximity probe or magnetic pickup. Use PAS channels 1 through 6 for the supported vibration, position, acceleration, velocity, or dynamic-pressure measurements in Bently Nevada 3701/40 177896-05 / 3701/40 177988-01.

Why might the buffered signal from Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 look correct while the monitor value is wrong?

The buffered connection on the 177988-01 side of Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 represents the conditioned analog path, while the 177896-05 side applies digitization, filtering, measurement, alarm, and logic settings. Compare the PAS waveform with the processor configuration before assigning the problem to either module in Bently Nevada 3701/40 177896-05 / 3701/40 177988-01.

Which communication path should be checked when Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 is visible in BNMC but not in the plant system?

Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 can use different processor communication roles for BNMC, System 1, Modbus TCP, and Ethernet Global Data. Verify the selected 177896-05 Ethernet port, addressing, protocol configuration, cable, and switch path rather than assuming BNMC visibility proves every plant communication path for Bently Nevada 3701/40 177896-05 / 3701/40 177988-01.

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Product Name	Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 \| 3701/40 Processor and PAS Input Modules
Item NO.	2926051
Weight	0.1 kg = 0.2205 lb = 3.5274 oz
Category	BENTLY NEVADA
Brand	Bently Nevada
Creation Time	2026-10-22

Bently Nevada 3701/40 177896-05 / 3701/40 177988-01 | 3701/40 Processor and PAS Input Modules Item NO.: 2926051