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Project Behavior Recommended Cycle Maintenance During Operation Inspection During Downtime Field Control Station Controller Indicator Light Status Inspection Daily ★ Controller Operating Software Version Detection Every 2 years ★ Battery Replacement After 3 months of cumulative power outages ★ Controller Load Rate Detection Every 2 years ★ Controller Redundancy Switching Detection Every 2 years ★ Cabinet Door Closure Status Inspection Daily ★ Cabinet Operating Environment Inspection Daily ★ Cleaning of Cabinet Operating Environment Every 2 years ★ I/O Card Indicator Light Status Inspection Daily ★ I/O Card Channel Precision Detection Every 2 years ★ I/O Card Redundancy Switching Detection Every 2 years ★ System Alarms Inspection Daily ★ Cabinet Cooling Fans Inspection Every 3 months ★ ★ Replacement of Cabinet Cooling Fans Every 2 years ★ ★ Cabinet Sealing (against mice, dust, corrosion, etc.) Inspection Every 2 years ★ System Power Supply Detection Every 2 years ★ Field Computers (Servers, Operator Stations, Engineer Stations) Backup of System Configuration Data Before/after each modification ★ Installation Status of Utility Software Inspection Every 3 months ★ ★ Computer Viruses Inspection Every 3 months ★ Operation Status of SIS System Software Inspection Every 3 months ★ Download of Configuration Detection Every 2 years ★ Hard Drive Space Inspection Every 3 months ★ ★ IP Addresses Detection Every 3 months ★ ★ Real-time Data Inspection Daily ★ Historical Trends Inspection Daily ★ System Status Display Inspection Daily ★ Audio/Visual Alarms Detection Every 2 years ★ Communication Network Function and Load of Control Network Detection Every 2 years ★ Function and Load of Operation Network Detection Every 2 years ★ Network Cables Detection Every year ★ Replacement of Network Cables Every 3–5 years ★ Control Room Environment Indoor Temperature Inspection Daily ★ Indoor Humidity Inspection Daily ★ Corrosion of Hardware Inspection Every 3 months ★ Dust Accumulation inside Components Inspection Every 3 months ★ Cleaning of Dust Accumulation inside Components Every 2 years ★ Labeling of Various Cables Inspection Every year ★ Labeling of System Components Inspection Every 2 years ★ Tightness of Various Connectors Inspection Every 2 years ★ Grounding System Ground Resistance of SIS System Detection Every 2 years ★ Grounding of Signal Line Shielding Detection Every 2 years ★ Lightning Protection Measures Inspection Every 2 years ★