Host Redundancy¶
Configure primary and secondary Modbus device hosts for automatic failover.
Screenshot placeholder: Host redundancy diagram
How It Works¶
- Gateway polls primary host
- Reads all tag data normally
- If primary fails → automatic failover to secondary
- Monitor checks primary health
- Auto-reconnect to primary when available
Configuration¶
Device Setup¶
Screenshot placeholder: Device host configuration
- Edit device
- Set Primary Host (IP/hostname)
- Set Secondary Host (IP/hostname)
- Both hosts must be same slave/unit ID
- Save
Use Cases¶
- Redundant PLC configurations
- Hot-standby equipment
- Load-balanced devices
- High-availability systems
Failover Triggers¶
- Connection timeout
- Repeated read failures
- Network unreachable
- Device not responding
Best Practices¶
- Ensure devices synchronized
- Test failover regularly
- Monitor both hosts
- Use consistent addressing