WEEK 12 Stage 2 · Hands-on lab 10 hours Field visit #3

Capstone B: Virtual Chilled-Water Plant

DELIVERABLE Virtual chilled-water plant demo

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Learning objectives

>Integrate a simulated plant, control logic, BACnet/Modbus exposure, trends and tags into one system
>Write and test FDD rules with persistence and time delays
>Present technical results as a customer-facing case study

Sessions

Three 2-hour weeknight sessions plus a weekend block. Check each one off as you finish it.

SESSION 1· 2 h Combine the Week 9 plant model and logic. Expose the points over BACnet (or Modbus)
SESSION 2· 2 h Log trends with BAC0/PyModbus. Apply your Haystack tags
SESSION 3· 2 h Add three FDD rules: low DP with pumps at 100%, commanded on with no status, no rotation in more than 7 days
WEEKEND· 4 h Write a one-page case study and do a full demo run-through. Field visit #3

Quiz

Score: 0 / 5 · aim for 4+

Answer in your notebook first, then reveal the answer and grade yourself honestly.

Q1Write pseudo-code for an FDD rule that flags low loop DP while pumps run at full speed.

[ reveal answer ]

IF dp < dp_sp − tol AND all running pump speeds ≥ 98% FOR 15 min THEN alarm 'insufficient pump capacity or DP sensor fault'.
Q2Why do FDD rules need time delays or persistence checks?

[ reveal answer ]

To avoid nuisance alarms during startups, staging and other transients.
Q3Which two points does a 'commanded on, no status' rule need, and what are their point types?

[ reveal answer ]

A BO command and a BI status (or a network status point).
Q4How would you describe the value of this demo to a building owner in one sentence?

[ reveal answer ]

For example: 'It keeps pressure where it's needed using the least pump energy, and it flags problems before occupants notice.'
Q5Name two things that would change if you moved this lab onto a real Niagara or Metasys job.

[ reveal answer ]

Examples: vendor programming tools and licensing, real I/O and wiring, network design and security, graphics, commissioning, and owner training.

// PROGRAM CHECKPOINT

you can discover and command BACnet devices, write and tune control logic, read PLC code, and explain how data flows from sensor to front end to analytics.