DCS System Configuration Requirements

1. System Capacity Specifications

a) Redundancy and Reserve Rules

• I/O Modules

  • Reserve ≥ 10% of each type of I/O points

  • Reserve ≥ 10% of module slots (plug-and-play ready)

• Controller Processing Capacity

  • ≥ 60% margin under normal conditions

  • ≥ 40% margin under stress conditions

• Operator/Server Workstations

  • ≥ 60% CPU margin under stress conditions

• Memory Capacity

  • ≥ 40% margin in RAM

  • ≥ 60% margin in external storage

• Communication Load Limits

  • Token bus load rate ≤ 40%

  • Ethernet load rate ≤ 20%

b) I/O and Control Loop Capacity

• I/O point count per cabinet/station must meet operational demands

• Control loop capacity must satisfy process requirements

c) Power Supply

• Logic and field power supplies must meet applicable codes

• Reserve capacity must be considered

d) Database Storage

• Real-time and historical database capacity must meet operational needs

• Reserve storage must be ensured

e) Cross-System Data Exchange

• Data exchange capacity with other systems must match unit-level demand

• Reserve for expansion must be considered

f) Alarm Information Retention

• Must store alarm records for ≥ 30 days

• Support both display and printing

g) System Scalability

• The system must support sufficient operator stations, field control stations, and function modules, with future expansion capability