Digital guide
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Bently 3500/91 EGD Communication Gateway Module
Technical Specifications:
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Ethernet Ports: 1 × 10/100BASE-TX RJ45, auto-MDIX
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Serial Ports: 1 × RS-232/485 isolated, 1,200–230 kbaud
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Protocols Supported:
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EGD v2.01 producer/consumer
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Modbus RTU/TCP (slave)
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BACnet/IP option
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Data Update Rate: <1 s typical (rack scan dependent)
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On-board Memory: 512 kB circular buffer for transient snapshots
Detailed content
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Power Consumption: 5.0 W (RS-485 I/O) / 5.6 W (Ethernet I/O)
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Operating Temperature: –20 °C to +50 °C
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Storage Temperature: –40 °C to +70 °C
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Dimensions:
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Main module: 241 × 24 × 242 mm, 0.79 kg
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I/O module: 241 × 24 × 99 mm, 0.39 kg
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Agency Approvals: CE, UL, optional ATEX/IECEx
Functional Features:
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Publishes rack, module, channel and set-point data as EGD frames
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Accepts consumer commands (reset, trip multiply, alarm inhibit) over EGD
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No additional software required for basic Modbus register access
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Hot-swappable when second communication module is present
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Firmware upgrade via USB or Ethernet without rack shutdown
Application Scenarios:
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Exporting turbine shaft vibration to plant DCS for closed-loop load control
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Writing compressor suction temperature set-points from operator HMI
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Broadcasting fan motor current to plant-wide energy management system
