Bently Nevada 3500/92 Communication Gateway Module
Overview
The Bently Nevada 3500/92 Communication Gateway is the 3500 rack module that hands machinery protection data to the rest of the plant. It provides communication of all rack monitored values and statuses to process control and automation systems over Ethernet TCP/IP and serial RS232, RS422 or RS485 links, and it also allows the 3500 Rack Configuration Software and Data Acquisition Software to reach the rack over Ethernet. With the Bently Nevada 3500/92 installed, a DCS, PLC or HMI can display vibration, position, temperature and alarm status from the protection rack without hard-wiring every value as a 4 to 20 mA signal.
Seven Star LLC supplies the Bently Nevada 3500/92, its four I/O module variants, cables and accessories to plants in the Sultanate of Oman and across the GCC, with engineering support in Muscat. The manufacturer datasheet (141542 Rev. N) is attached to this page, and our engineers can help select the I/O module and cabling that match the host system.
Operating Principle
Inside the rack, the Bently Nevada 3500/92 collects data from the other modules over a high-speed internal network: current measured values with time stamp, module statuses and current alarm statuses. The exact data returned depends on each module type and its channel configuration. The collection rate depends on the rack configuration but will not exceed 1 second for all modules in the 3500 rack, which is fast enough for operator displays, historian trends and alarm annunciation in the control room. Protective action itself remains in the monitors and relay modules, so the gateway does not sit in the trip path.
On the host side three protocols are supported. Modicon Modbus, based on the AEG Modicon PI-MBUS-300 reference and using RTU transmission mode, runs over the serial ports. Modbus/TCP, the TCP/IP variant of Modbus, runs over Ethernet. A proprietary Bently Nevada host protocol over Ethernet TCP/IP links the rack to the configuration and data acquisition software. The Ethernet link is 10 Mbps, conforms to IEEE 802.3 and uses an RJ45 connection for 10BASE-T star networks. The Bently Nevada 3500/92 keeps the interfaces and features of the original 3500/90, except the primary value Modbus registers; their function is now provided by a Configurable Modbus Register Utility.
Engineering Design of the Bently Nevada 3500/92
The Bently Nevada 3500/92 occupies one full-height front slot and one full-height rear slot. The main board measures 241 × 24.4 × 242 mm and weighs 0.82 kg, and its front panel carries OK and TX/RX LEDs that show the module is healthy and communicating with the other modules in the rack. The rear I/O module, 99.1 mm deep and 0.44 kg, defines the physical ports: Modbus RS232/RS422, Modbus RS485, Ethernet with RS232 Modbus, or Ethernet with RS485 Modbus. Typical power consumption is 5.0 W with the RS232/RS422 I/O module and 5.6 W with the RS485 module.
Serial runs can be long: the datasheet gives a total RS485 cable run of up to 4000 feet (1220 m), and RS422 runs of up to 4000 feet between racks, which allows several racks in a compressor house or turbine hall to share one host link. RS422 cables can be used for rack-to-rack connections with Modbus RS485 I/O modules, while the final rack-to-host connection is application specific. Older gateway modules need firmware upgrade kit 126M4118-01 to communicate with a new I/O module; the Ethernet I/O spares already include it.
Key Features
The Bently Nevada 3500/92 brings the following capabilities to a 3500 rack, as listed in its datasheet:
- Access to all rack monitored values, module statuses and alarm statuses with time stamps.
- Modbus RTU over RS232, RS422 or RS485, based on the Modicon PI-MBUS-300 reference.
- Modbus/TCP over 10 Mbps Ethernet with an RJ45 10BASE-T connection.
- Ethernet access for 3500 Rack Configuration Software and Data Acquisition Software.
- Data collection from all modules in the rack within 1 second or less.
- Configurable Modbus Register Utility for mapping the values the host needs.
- Four I/O module variants to match serial-only or Ethernet-plus-serial host connections.
- DNV GL and ABS marine classification, with cNRTLus, ATEX and IECEx approval options.
Industrial Applications
Most 3500 racks in Oman protect critical machines that are run from a central control room: gas turbine generators at independent power plants, compressor trains at gas processing plants, and large pumps and blowers in refineries and fertiliser plants. The Bently Nevada 3500/92 is the usual way to bring the rack’s overall vibration, position and temperature values into the DCS or a PLC-based unit control panel, so operators can see trends and pre-alarms on the same screens as process data. Modbus/TCP suits modern Ethernet control networks, while RS485 and RS422 links remain common on older Modbus serial infrastructure.
The gateway sits beside other communication and data modules such as the Bently Nevada 3500/22M Transient Data Interface, which feeds waveform data to condition monitoring software, and draws power from the rack’s 3500/15 AC/DC Power Supply Module. An overview of the rack architecture is on our Bently Nevada 3500 Machinery Protection System page. Seven Star LLC helps plants in Oman and the GCC choose the I/O option, cables and converters for the Bently Nevada 3500/92 and plan the Modbus register map.
See also: Bently Nevada 3500/20 Rack Interface Module.
Ordering Information
The Bently Nevada 3500/92 is ordered as 3500/92-AA-BB-CC with these options from the datasheet:
| Option | Code | Description |
|---|---|---|
| A: I/O Module Type | 01 | ModbusRS232/RS422 I/O Module |
| A: I/O Module Type | 02 | ModbusRS485 I/O Module |
| A: I/O Module Type | 03 | Ethernet/RS232 Modbus I/O Module |
| A: I/O Module Type | 04 | Ethernet/RS485 Modbus I/O Module |
| B: Memory Type | 01 | Low Memory |
| C: Agency Approval | 00 | None |
| C: Agency Approval | 01 | CSA/NRTL/C |
| C: Agency Approval | 02 | CSA/ATEX/IECEx |
Spares, cables and accessories listed for the Bently Nevada 3500/92:
| Part Number | Description |
|---|---|
| 136180-01 | 3500/92 Communication Gateway Module |
| 125736-01 | Modbus RS232/RS422 I/O Module |
| 133323-01 | Modbus RS485 I/O Module |
| 136188-01 | Ethernet/RS232 Modbus I/O Module (includes Firmware Upgrade Kit 126M4118-01) |
| 136188-02 | Ethernet/RS485 Modbus I/O Module (includes Firmware Upgrade Kit 126M4118-01) |
| 126M4118-01 | Firmware Upgrade Kit |
| 137495-01 / 137494-01 | Firmware IC (Odd bank / Even bank) |
| 138131-AAA | Standard 10BASE-T Shielded Category 5 Cable with RJ-45 connectors, lengths 006 to 320 ft |
| 130419-AAAA-BB | RS232 Cable, Host to 3500/92 (10, 25, 50 or 100 ft) |
| 130420-AAAA-BB | RS232 Cable, Honeywell PLCG to 3500/92 |
| 130119-01 | RS232 Cable, Host Computer to RS232/RS422 Converter |
| 130530-AAAA-BB | RS422 PVC Insulated Cable, RS232/RS422 Converter to 3500/92 |
| 129665-AAAA-BB | RS422 PVC Insulated Cable, 3500/92 to 3500/92 |
| 131109-AAAA-BB | RS422 Teflon Insulated Cable, RS232/RS422 Converter to 3500/92 |
| 130531-AA-BB | RS422/RS485 Extension Cable, 500 ft standard, for runs over 500 ft |
| 139036-01 | 9-pin D-SUB “Y” |
| 02230411 / 02230412 | RS232 to RS422 Converter, 110 Vac / 220 Vac |
| 165M2516 | 24-port 100/1000 SFP BE based switch |
| 02200260 / 02200261 | Ethernet transceivers: 15-pin AUI male to fiber optic (10BASE-FL, ST) / to Thinnet (10BASE2) |
| 02175190 / 02175191 / 02175192 | 10BASE-T shielded Category 5 cable with RJ-45 connectors, 6 / 10 / 25 ft |
| 04425545 | Grounding Wrist Strap (single use) |
Technical Specifications
Key Bently Nevada 3500/92 data from datasheet 141542 Rev. N:
| Parameter | Specification |
|---|---|
| Model | Bently Nevada 3500/92 Communication Gateway |
| Data collected | Current measured values with time stamp, module statuses and current alarm statuses |
| Update time | Depends on rack configuration; not more than 1 second for all modules |
| Protocols | Modbus (RTU, per AEG Modicon PI-MBUS-300); Modbus/TCP; Bently Nevada host protocol over TCP/IP |
| Ethernet | 10 Mbps, IEEE 802.3, RJ-45 for 10BASE-T |
| Serial interfaces | RS232, RS422 or RS485 depending on I/O module |
| Cable runs | RS485 total up to 4000 ft (1220 m); RS422 up to 4000 ft between racks |
| Front panel LEDs | OK, TX/RX |
| Power consumption | 5.0 W typical (RS232/RS422 I/O); 5.6 W typical (RS485 I/O) |
| Operating temperature | −30 to +65 °C |
| Storage temperature / humidity | −40 to +85 °C; 95% non-condensing |
| Main board dimensions / weight | 241 × 24.4 × 242 mm; 0.82 kg |
| I/O module dimensions / weight | 241 × 24.4 × 99.1 mm; 0.44 kg |
| Rack space | 1 full-height front slot; 1 full-height rear slot |
| Approvals | FCC Part 15; EMC and LV directives; RoHS; DNV GL; ABS; cNRTLus; ATEX/IECEx II 3 G |
How to Order
To request a quotation for the Bently Nevada 3500/92, send Seven Star LLC the full 3500/92-AA-BB-CC code, or describe the host system, the protocol (Modbus RTU or Modbus/TCP) and the physical interface you need, together with any cable lengths. Our team in Muscat will confirm availability and lead time for the gateway, I/O module and accessories, and the datasheet is available from the documents tab on this page. We supply the Bently Nevada 3500/92 to customers in Oman and the GCC.
- Datasheet Bently Nevada 3500/92 Communication Gateway Datasheet (141542 Rev. N) Download
Bently Nevada 3500 modules and transducers
The listed 3500 modules include the 3500/20 Rack Interface Module, the 3500/50M Tachometer, the 3500/61 Temperature and 3500/62 Process Variable monitors, the 3500/64M Dynamic Pressure monitor, the 3500/44M for aeroderivative gas turbines and the 3500/46M Hydro monitor. Reciprocating compressor monitoring is covered by the 3500/70M, 3500/72M and 3500/77M. The 3500/92 Communication Gateway and 3500/94M display link the rack to the control system. Transducers include the 3300 XL proximity probe system, the 330400 accelerometer and the 190501 Velomitor CT velocity transducer. The manufacturer's newer platform, Orbit 60, is offered as the modernization path for 3500 racks, and System 1 software handles diagnostics.Where Bently Nevada vibration monitoring is used
Steam and gas turbines, generators, centrifugal and reciprocating compressors, large pumps, hydro units and cooling tower fans in oil and gas, power generation, petrochemical and mining plants are the usual machines. Measurements include radial vibration, thrust position, speed, phase, differential expansion, bearing temperature, rod position and cylinder pressure.Ordering Bently Nevada parts: what we need
Send the complete part number with every option field, for example 330103-00-05-10-01-00 for a probe or the 3500 module number with its option dashes, plus the matching I/O module number. For probe systems state probe series, system length and the hazardous area approval. A photo of the label avoids transcription errors, and for rack modules the firmware revision is useful.Browse Bently Nevada products by category: Vibration.
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