Bently Nevada 3500/32 125720-01 Spare 4-Channel Relay I/O Module
The Bently Nevada 125720-01 is a precision spare 4-channel relay i/o module for the Bently Nevada 3500 Series machinery protection platform. TX/RX LED: Flashes to indicate proper communication between this module and other modules within the rack. | CH ALARM LED: Lights up when the relay channel is in an alarm state. | Sealing: Epoxy-sealed. Factory-sealed, fully tested on a live 3500 rack with 48-hour burn-in at 55°C. 12-month warranty. Ships within 24 hours from Shenzhen.
Technical Specifications
| Bently Nevada 125720-01 | is a 4-Channel Relay I/O Module designed for use within the Bently Nevada 3500 series systems. This module features four relay outputs and can be installed in any slot to the right of the Rack Interface Module. The outputs can be programmed independently to perform custom voting logic. Each relay includes Alarm Drive Logic, which can be configured with AND and OR logic to respond to alarms (alerts and dangers) from any combination of monitor channels within the rack. |
|---|---|
| OK LED | Illuminates when the module is functioning properly. |
| TX/RX LED | Flashes to indicate proper communication between this module and other modules within the rack. |
| CH ALARM LED | Lights up when the relay channel is in an alarm state. |
| Sealing | Epoxy-sealed |
| Arc Suppressor | 250 Vrms, installed as standard |
| Contact Life | 100,000 cycles at 5 A, 24 Vdc or 120 Vac |
| Operation | Each channel is switch-selectable for Normally De-energized or Normally Energized |
| Part Number | 125720-01 |
| Manufacturer | Bently Nevada |
| Product Type | Relay I/O Module |
| Operating Temperature | -30 °C to +65 °C |
| Storage Temperature | -40 °C to +85 °C |
| Dimensions (H x W x D) | 241 mm x 24.4 mm x 99.1 mm |
| Weight | 0.4 kg |
| Humidity | 95%, non-condensing |
| Availability | In Stock |
| Country of Manufacture | United States (USA) |
| Model / SKU | 125720-01 |
✓ Ships within 24 hours | ✓ 12-Month Warranty | ✓ Worldwide Delivery
Detailed Product Information
🎯 System Integration
The Bently Nevada 125720-01 connects the 3500 rack to plant condition monitoring and historian infrastructure, streaming real-time vibration and temperature data to System 1, OSIsoft PI, or DCS via Modbus TCP.
Network Options
- Copper (146031-01): 10/100Base-TX, max 100m.
- Fiber (146031-02): 100Base-FX, max 2km — ideal for long runs or high-EMI areas.
Configuration
Static IP mandatory — DHCP expiry causes data gaps. Configure NTP for accurate timestamps. Allow TCP 3500 + TCP 502 through OT firewall.
🔧 Technical Specifications
Specifications
| Parameter | Value |
|---|---|
| Bently Nevada 125720-01 | is a 4-Channel Relay I/O Module designed for use within the Bently Nevada 3500 series systems. This module features four relay outputs and can be installed in any slot to the right of the Rack Interface Module. The outputs can be programmed independently to perform custom voting logic. Each relay includes Alarm Drive Logic, which can be configured with AND and OR logic to respond to alarms (alerts and dangers) from any combination of monitor channels within the rack. |
| OK LED | Illuminates when the module is functioning properly. |
| TX/RX LED | Flashes to indicate proper communication between this module and other modules within the rack. |
| CH ALARM LED | Lights up when the relay channel is in an alarm state. |
| Sealing | Epoxy-sealed |
| Arc Suppressor | 250 Vrms, installed as standard |
| Contact Life | 100,000 cycles at 5 A, 24 Vdc or 120 Vac |
| Operation | Each channel is switch-selectable for Normally De-energized or Normally Energized |
Installation
- Install in assigned rack slot per configuration drawing.
- Copper: CAT5e UTP 100m max. Fiber: 62.5/125μm multimode SC 2km max.
- Assign static IP. Configure NTP. Document settings.
- Verify STATUS LED green and data flowing before returning to service.
📦 Shipping & Warranty
24-hour handling. Anti-static packaging. DHL/FedEx/UPS. 12-month warranty covering port failure, firmware issues, communication dropout.
❓ FAQ
Q: Copper or fiber?
A: Fiber for runs over 100m, high-EMI environments, or electrical isolation requirements. Copper for standard control room under 100m.
Q: Does replacement require reconfiguration?
A: Yes — IP settings are stored on the module. Document your settings before removing the old module.
💰 ROI
The TDI module enables predictive maintenance. One avoided bearing failure on a 50 MW turbine saves $250K-500K. Without it, your 3500 rack is just a trip system.
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