What causes fault code GEN-SCADA1 (SCADA Server Communication Lost)?

Network infrastructure failure — switch, router, or fiber optic link. SCADA server application crashed or froze. Database server overloaded — historical data queries blocking real-time. Firewall rule change blocking OPC or Modbus traffic. Server hardware fault — NIC, memory, or storage failure

How do I fix fault code GEN-SCADA1?

Check SCADA server status — application running, CPU and memory usage. Verify network connectivity — ping PLCs from SCADA server. Check network switches and routers in the path. Review Windows Event Log for errors on SCADA server. Restart SCADA application if hung — do NOT restart server unless necessary. Check OPC server connections — may need manual reconnection

SCADA Server Communication Lost

GEN-SCADA1

SCADA or DCS server lost communication with field devices. Operator screens showing stale data or communication errors.

high general

scada server communication opc network

Probable Causes (ranked)

Network infrastructure failure — switch, router, or fiber optic link
SCADA server application crashed or froze
Database server overloaded — historical data queries blocking real-time
Firewall rule change blocking OPC or Modbus traffic
Server hardware fault — NIC, memory, or storage failure

Fix Steps

1 Check SCADA server status — application running, CPU and memory usage
2 Verify network connectivity — ping PLCs from SCADA server
3 Check network switches and routers in the path
4 Review Windows Event Log for errors on SCADA server
5 Restart SCADA application if hung — do NOT restart server unless necessary
6 Check OPC server connections — may need manual reconnection

Field Trick

Before restarting the SCADA server, try just restarting the OPC or communication service. Full server restart can take 15-20 minutes. Service restart is usually 30 seconds.

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