BENTLY 146031-02 3500 System Module

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• • • • • • • Bently Nevada 146031-02 — 3500/22M TDI Rear I/O Module, 100BASE-FX Fiber Optic Ethernet

              The 146031-02 is the repr I/O (input/output) module that mates with the front 3500/22M Transient Data Interface (TDI) card (e.g. 138607-01). It plugs into the rear of the 3500 rack in the slot directly behind the TDI and provides the fiber-optic Ethernet uplink, rack-OK relay, and the rack-level control contacts (Trip Multiply, Alarm Inhibit, Rack Reset).

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              Key Technical Specifications

              表格

              Item	Specification
              Manufacturer	Bently Nevada (Baker Hughes)
              Catalog number	146031-02
              Function	Rear I/O module for 3500/22M TDI (ordering code 3500/22-A01-B02-Cxx)
              Network interface	100BASE-FX fiber-optic Ethernet, full-duplex multimode, IEEE 802.3u
              Fiber connector	MT-RJ male on the card (use MT-RJ female on the patch cord)
              Max. fiber length	2,000 m (6,560 ft) multimode
              Protocols	BN Host Protocol + BN TDI Protocol over TCP/IP
              OK relay rating	5 A @ 24 VDC / 120 VAC, 120 W / 600 VA; normally energized; field-selectable fail state; arc-suppressed
              System contacts	Trip Multiply, Alarm Inhibit, Rack Reset — dry contact, <1 mADC each
              Signal common	2-pin terminal for single-point instrument ground
              Data channels supported	Up to 48 monitor channels of waveform data (front card dependent)
              Keyphasor inputs	4 system Keyphasor signals (routed via rack backplane)
              Power consumption	Part of TDI's 10.5 W total
              Operating temperature	−30 … +65 °C
              Storage temperature	−40 … +85 °C
              Humidity	95 % non-condensing
              Dimensions (H×W×D)	241.3 × 24.4 × 99.1 mm
              Weight	0.20 kg
              Rack space	1 full-height rear slot (directly behind the TDI front card)
              Approvals	cNRTLus Class I Div 2 / Zone 2; ATEX/IECEx; CE; DNV-GL; ABS; FCC Part 15; RoHS

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              Advantages & Features

              • Fiber-optic uplink — 100BASE-FX multimode fiber reaches up to 2 km, versus 100 m for copper 10/100BASE-TX.
              • Galvanic isolation — fiber eliminates ground loops and lightning/EFT surges between the 3500 rack and the plant network switch.
              • Noise immunity — preferred in high-EMI environments (large motors, VFDs, switchgear).
              • All rack-level field wiring lands here — OK relay, Trip Multiply, Alarm Inhibit, Rack Reset and signal-common ground are on this rear card.
              • Hot-swap friendly — field wiring terminates on the I/O module, so the front TDI can be removed without disturbing plant wiring.
              • Matches the 138607-01 front TDI — the standard pair sold for new or retrofit racks.
              • Gold-plated relay option available (ordering code B04) for low-level signal switching — the -02 uses standard tinned contacts.
              • Marine certified — ABS and DNV-GL approvals for offshore and shipboard installations.
              • Not in the critical trip path — loss of the I/O only stops data streaming; monitor protection continues.

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              Typical Applications

              • Rear I/O for any 3500/22M TDI rack needing a fiber Ethernet uplink
              • Long-distance runs between the 3500 rack and the plant switch / System 1 server
              • Locations with heavy electrical noise (VFD-driven pumps, motor control centers)
              • Offshore platforms, FPSOs and shipboard machinery rooms
              • Plants where ground-fault isolation between rack and network is required
              • Retrofit of older 3500/20 RIM racks that previously used copper TDXnet

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