|
Controls Functional Description
Single document so process engineer, programmer and
operator all reference the same document
Control Loops
- Controller action, scale, tracking, etc.
- Cascade controller relationships
I/O
- AI, AO, DI, DO
- Instrument types Channel assignments
- Scaled ranges Scan rates
Alarms & Interlocks
- Setpoints and priorities
- Delays and conditional alarming
- Interlock actions
Expanded Control Loop Description
- Used to define complex control loops or
calculations
|
QIC-E101-01
(Heat Duty)
q = Q / [7.49e-5 * d * (T2
– T1)]
Q = Heat Duty (QI-E101-01) Operator Input (MBTU/hr)
q = Hot Oil supply Flowrate (FI-E101-01)
Calculated Setpoint (GPM)
d = Hot Oil Density [5.835] (lb/gal)
T2
= Hot Oil Supply Temperature (TI-E101-02) Process
Variable (°F)
T1
= Hot Oil Return Temperature (TI-E101-04) Process
Variable (°F) |
Sequential Programming
- Detailed step-by-step logic for automatic system operation
- Required for "push button operation"
- Developed first by process engineer
- Reviewed and finalized with controls engineer
- Process engineer, programmer and operator have a single reference
document
Factory
Acceptance Testing Follows Module
Assembly FAT Document. Detailed testing done throughout project
to ensure final control system will be ready for commissioning
when delivered.
Test In-House and at Panel Fabrication Shop with HMI
- Control System FAT
- Screen layout and functionality
- Control loop functionality
- Alarms and interlocks
- Sequence programming
- Each physical I/O point
Test at Module Assembly Shop
- Half Loop FAT
- All instrument functionality
- Complete loop test
|