ข่าวสาร result OPC DA

Trace frozen OPC tags in ABB 800xA and GE PACSystems by checking source values, item paths, timestamps, scan groups, deadband, and controller communication load.

The link light is green, but OPC tags have stopped updating. Check PLC address mapping, scan and subscription rates, and communication load before blaming the network.

A practical troubleshooting playbook when your OPC DA/UA link stays green but SCADA tags freeze at stale values.

Shift-change SCADA slowdowns in Honeywell Experion PKS are a load management problem, not hardware failure. Six operators logging in simultaneously spike server CPU to 85–95% for four minutes, dropping tag scan rates from 500 ms to 2,000 ms. This guide identifies the root causes and delivers specific configuration fixes — including staggered login scheduling, report task offloading, and alarm database tuning — to restore full performance during the critical handover window.