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Control systems knowledge
Practical information for industrial automation, PLCs, SCADA, instrumentation, networking, control panels, and water and wastewater systems.
CurryControls.com brings practical controls knowledge, engineering references, troubleshooting guides, and useful industry tools together in one place.
- Indexed topics
- 530
- Written guides
- 29
- Knowledge sections
- 9
- Levels of navigation
- 5
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Knowledge base
Explore control systems
Every area of the taxonomy resolves to a real page with its own breadcrumbs, related topics, and structured data.
PLC Systems
Architecture, programming, analog control, communications, and troubleshooting for programmable logic controllers.
63 topics
SCADA & HMI
Supervisory control, operator interface design, alarm management, and historian data.
52 topics
Instrumentation
Flow, level, pressure, and analytical measurement — selection, installation, signals, and calibration.
44 topics
Control Panels
UL 508A design, pump and PLC panels, component selection, and panel troubleshooting.
42 topics
Water Systems
Potable water treatment, pumping, storage, and membrane systems.
28 topics
Wastewater Systems
Lift stations, treatment processes, and wastewater pump control.
26 topics
OT Security
The fundamentals that everything else rests on.
5 topics
Drawings
The drawing set a control system is built from.
5 topics
Site structure
Built for a site of thousands of pages
The navigation is generated from a single structured taxonomy, five levels deep, so new content slots into the menu, the breadcrumbs, the search index, and the sitemap at once.
Controls
The core disciplines of an industrial control system: the logic solver, the operator interface, the field devices that measure the process, and the panel that ties them together.
205 topics4 areas
Water & Wastewater
Municipal water and wastewater is where most of this control work lands. Process context first, then the control strategy that serves it.
56 topics2 areas
Troubleshooting
Organized by symptom, not by product. Start with what you can observe, work through what to check first, and narrow it down without guessing.
97 topics15 areas
How-To
Step-by-step procedures for the tasks that come up on real jobs. Each one is written to be worked through with the equipment in front of you.
36 topics5 areas
Engineering Library
Reference material for the documents a control system is designed, built, and handed over with.
34 topics5 areas
Cybersecurity
Operational technology security for control systems, written for the people who actually maintain them.
70 topics13 areas
Symptom first
Troubleshooting library
Organized by what you can observe, not by product. Symptom, likely causes, what to check first, then a diagnostic procedure.
Step by step
How-to guides
Procedures written to be worked through with the equipment in front of you, including what to verify before you leave.
Latest
Recently published and revised
Content is revised as field experience corrects it. Each entry carries its published and updated dates.
ReferenceWastewaterLevel
Wet Well Level Control
The measurement that runs a lift station: choosing setpoints, protecting the pumps, validating the signal, and the failures that flood a station.
9 min readUpdated Aug 30, 2026
ReferenceAnalogInstrumentation
4-20 mA Current Loops
Why the industry standardized on current instead of voltage, how a two-wire loop is powered, what the live zero buys you, and how to read a loop with a meter.
12 min readUpdated Aug 29, 2026
ReferenceCybersecurityWater
Water and Wastewater Utility Threat Landscape
What has actually happened at water utilities, what those incidents had in common, and the small number of controls that would have prevented most of them.
8 min readUpdated Aug 28, 2026
ReferenceWastewaterLift Stations
Duplex Lift Station Controls
The two-pump station that makes up most of a collection system: what is in the panel, how the sequence works, what is monitored, and where these stations actually fail.
11 min readUpdated Aug 27, 2026
ReferenceCybersecurityOT
OT Security vs IT Security
Why the familiar security priorities invert on a plant floor, and what that changes about patching, scanning, authentication, and incident response.
8 min readUpdated Aug 26, 2026
ReferencePanelsUL 508A
UL 508A Industrial Control Panels
What the listing actually covers, what has to appear on the label, and the requirements that most often cause a panel to fail inspection.
9 min readUpdated Aug 25, 2026
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About
About CurryControls.com
CurryControls.com is independently owned and maintained by Eric Sullivan.
Eric Sullivan previously worked with Curry Controls Company and left the company in 2021. He is currently employed by General Control Systems, Inc. Eric Sullivan is not affiliated with Curry Controls Company, and General Control Systems, Inc. is a separate company that is not affiliated with Curry Controls Company.
This site is being developed as an independent technical information resource focused on control systems, automation, instrumentation, engineering, and the water and wastewater industry.
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