Description
Product Introduction & Engineering Value
Machinery protection data has little value if it cannot reach the control system quickly and reliably. The BENTLY 3500/91M EGD Communication Gateway bridges the 3500 Machinery Protection System with compatible automation platforms by transmitting monitored values, alarm status, and diagnostic information over an Ethernet Global Data (EGD) network.
Designed for applications requiring deterministic controller communication, the 3500/91M integrates directly into the 3500 rack and exchanges real-time machinery information with EGD-compatible systems, including GE Mark VIe turbine control systems. This architecture reduces hardwired interfaces while improving data availability for process control and asset management.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | BENTLY Nevada |
| Model | 3500/91M |
| Product Type | EGD Communication Gateway Module |
| Supported Protocol | Ethernet Global Data (EGD) Version 2.01 |
| Ethernet Protocol | UDP/IP |
| Ethernet Standards | IEEE 802.3, 10BASE-T, 100BASE-TX or 100BASE-FX (I/O dependent) |
| Rack Compatibility | BENTLY Nevada 3500 Series |
| Maximum Modules | One 3500/91M per 3500 rack |
| Compatible Systems | GE Mark VIe and other EGD-compatible controllers |
| Configuration | Through 3500 Rack Configuration Software |
| Primary Function | Transfers monitored values, alarms, and status information to plant control systems |
Field Application & The “Trench” Experience
A combined-cycle power station upgraded its turbine control system from hardwired interfaces to an Ethernet-based architecture. The machinery protection system remained operational, but operators wanted vibration, Keyphasor, and alarm data available directly within the GE Mark VIe controller.
Installing the 3500/91M eliminated numerous hardwired signal connections and enabled continuous exchange of machinery protection data through the EGD network. During commissioning, startup, synchronization, and load changes were monitored from both the turbine control system and the BENTLY Nevada rack without additional signal converters.
Typical applications include:
- GE Mark VIe turbine control integration
- Compressor protection data transfer to distributed control systems
- Power generation machinery monitoring over industrial Ethernet
Transparency SOP: QA & Testing
Every New Surplus or professionally refurbished 3500/91M completes a documented quality verification process before shipment.
- Confirm model number, hardware revision, and Ethernet I/O option.
- Inspect PCB assemblies, network connectors, LEDs, and backplane interfaces.
- Install the gateway in a compatible 3500 test rack.
- Verify EGD communication with a simulated controller.
- Confirm network link status, data mapping, and communication stability.
- Complete burn-in observation and final visual inspection before anti-static packaging.
The Veteran’s Tech Trap Guide
⚠️ Only one 3500/91M is supported per rack. Attempting to design a system with multiple EGD gateways in the same rack is not supported.
⚠️ Check TDI firmware before installation. The gateway requires a compatible 3500/22M Transient Data Interface (TDI) firmware revision. Older firmware may prevent successful communication.
⚠️ Select the correct Ethernet interface. Ordering options differ between 10/100BASE-T copper and 100BASE-FX fiber I/O modules. Choosing the wrong interface can require additional network hardware or prevent direct installation.
PRO TIP: Before replacing an existing gateway, back up the rack configuration and document all EGD exchange definitions. Recreating network mappings after installation is considerably more time-consuming than restoring the original configuration.
3500/91M
3500/91M
Dynamic FAQ
Q1. What is the purpose of the 3500/91M?
The 3500/91M transfers machinery monitoring data, alarm status, and diagnostic information from a 3500 rack to EGD-compatible industrial controllers using Ethernet communication.
Q2. Which communication protocol does it support?
The module supports Ethernet Global Data (EGD) Version 2.01 over Ethernet UDP/IP, making it suitable for integration with GE automation platforms and other compatible controllers.
Q3. Can multiple 3500/91M modules be installed in one rack?
No. Only one EGD Communication Gateway is supported in each 3500 rack.
Q4. Which Ethernet media types are available?
Depending on the ordered I/O module, the gateway supports 10BASE-T/100BASE-TX twisted-pair Ethernet or 100BASE-FX fiber-optic Ethernet.
Q5. How is New Surplus inventory verified?
Every module undergoes part number verification, PCB inspection, rack installation, Ethernet communication testing, network diagnostics, and functional verification before shipment.
Q6. What should be confirmed before replacing an existing gateway?
Verify the TDI firmware version, Ethernet media type, EGD configuration, controller compatibility, IP addressing, and network switch settings before commissioning the replacement module.
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