DDC Controller Selection Calculator
Controller I/O count from field device schedule.
Inputs
%
Results
Controllers required
3
Total hardware I/O77
I/O with spares93
Total I/O capacity102
Actual spare (%)24.5
Bottleneck I/O type3
Spare AI points6
Spare AO points9
Spare DI points4
Spare DO points6
Controller cost ($)$5,400
Expansion Alternative Cost$4,600
How to Use This Calculator
- Enter Analog inputs (AI), Analog outputs (AO), and Digital inputs (DI).
- Set Digital outputs (DO), Spare I/O capacity (%), and Controller Size.
- Adjust Small/Unitary (16 I/O, $800), Medium/Application (34 I/O, $1,800) as needed.
- Review the Controllers required result.
- Use Total hardware I/O and I/O with spares to inform your decision.
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