Industrial PoE Switch with Relay Alarm: Enabling Real-Time Response in Critical Networks
author: Olycom
2026-04-17
Why Relay Alarm Matters in Industrial Networks
In industrial environments, network visibility alone is not enough.
Events such as:
- Camera disconnection
- Power failure
- Network interruption
must trigger physical actions, not just logs.
How Relay Alarm Works
IM-FP21008GW provides dual relay outputs (Out1 / Out2):
- Normally Open (NO)
- Normally Closed (NC)
- Common (COM)
When an event occurs:
→ relay state changes (open/close)
→ external devices are triggered
What Problems It Solves
- Detect power failure via redundant power input
- Monitor network link status (ERPS <50ms recovery)
- Identify PoE device disconnection (up to 90W per port)
- Prevent overheating damage
Application Scenarios
CCTV / Surveillance: Trigger alarm when camera disconnects
Railway Network: Combine ERPS recovery with fault signaling
Power Substation: Integrate switch alarm with PLC control system
Key Technical Capabilities
- Dual relay outputs
- -40 to 75°C operating range
- 6kV surge protection
- ERPS <50ms recovery
- IEEE802.3bt (90W PoE)
Conclusion
The relay alarm function transforms the switch from a network device into a control node, enabling:
- IT to OT integration
- Real-time fault response
- Improved operational visibility
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