Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/91M |
| Base Model | 3500/91 |
| Brand | Bently Nevada |
| Product Type | EGD Communication Gateway Module |
| Application System | Bently Nevada 3500 Machinery Protection System |
| Communication Protocol | Ethernet Global Data (EGD) version 2.01; Ethernet UDP/IP |
| Ethernet Standard | IEEE 802.3; IEEE 802.3u |
| Ethernet Speed | 10 Mbps; 100 Mbps |
| Ethernet Media | 10BASE-T; 100BASE-TX twisted pair; 100BASE-FX fiber optic option |
| Electrical Connector | RJ-45 jack |
| Fiber Connector | MT-RJ jack |
| Producer Data | Rack, module, channel, and data value status; real-time floating-point values; system setpoints |
| Consumer Data | Group Reset; Group Trip Multiply; Group Alarm Inhibit; Group Special Alarm Inhibit |
| Power Consumption | 7.4 Watts typical |
| Rack Space | Main module: 1 full-height front slot; I/O module: 1 full-height rear slot |
| Main Module Dimensions | 241.3 mm x 24.4 mm x 241.8 mm |
| Main Module Weight | 0.79 kg |
| I/O Module Dimensions | 241.3 mm x 24.4 mm x 99.1 mm |
| I/O Module Weight | 0.39 kg |
| Operating Temp | -30 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Humidity | Up to 95%, non-condensing |
| Front Indicators | OK LED; TX/RX LED |
| Origin | Not specified in the supplied data |
Machinery Monitoring Data Interface
The 3500/91M transfers machinery-monitoring information from the 3500 rack through an Ethernet communication path. The producer exchange includes rack, module, channel, and data-value status together with floating-point measurement values and system setpoints.
Meanwhile, consumer exchanges allow external systems to issue defined group-level commands, including Group Reset, Group Trip Multiply, Group Alarm Inhibit, and Group Special Alarm Inhibit. This arrangement separates measurement transmission from command reception at the gateway interface.
Frequently Asked Questions (FAQ)
Q: Which Ethernet communication protocols does the 3500/91M support?
A: The module supports EGD version 2.01 and Ethernet UDP/IP. It supports 10 Mbps and 100 Mbps Ethernet communication.
Q: What physical network interfaces are specified for the module?
A: Electrical Ethernet uses an RJ-45 jack. Fiber-optic I/O modules can use an MT-RJ jack and support 100BASE-FX.
Q: How much rack space does the 3500/91M assembly require?
A: The main module occupies one full-height front slot, while the associated I/O module occupies one full-height rear slot.
Field Installation Guidelines
- Install the main module in the designated full-height front slot of the 3500 rack.
- Install the corresponding I/O module in the designated full-height rear slot.
- Verify that the selected Ethernet medium matches the installed interface, such as twisted-pair or fiber optic.
- Route Ethernet communication wiring separately from high-voltage power and high-current switching conductors where practical.
- Maintain proper cable shielding and grounding practices according to the plant installation standard.
- Verify the Ethernet connector and cable termination before energizing the rack.
- Confirm that the OK LED indicates normal hardware and operating status after startup.
- Confirm TX/RX activity when the module exchanges data with the rack or Ethernet network.
- Check network configuration and EGD data exchange parameters before connecting the gateway to the plant control network.
- Keep the installation within the specified operating temperature and non-condensing humidity limits.
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