Independent technical resource
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.
Knowledge base
Every area of the taxonomy resolves to a real page with its own breadcrumbs, related topics, and structured data.
Architecture, programming, analog control, communications, and troubleshooting for programmable logic controllers.
63 topics
Supervisory control, operator interface design, alarm management, and historian data.
52 topics
Flow, level, pressure, and analytical measurement — selection, installation, signals, and calibration.
44 topics
UL 508A design, pump and PLC panels, component selection, and panel troubleshooting.
42 topics
Potable water treatment, pumping, storage, and membrane systems.
28 topics
Lift stations, treatment processes, and wastewater pump control.
26 topics
The fundamentals that everything else rests on.
5 topics
The drawing set a control system is built from.
5 topics
Site structure
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.
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
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
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
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
Reference material for the documents a control system is designed, built, and handed over with.
34 topics5 areas
Operational technology security for control systems, written for the people who actually maintain them.
70 topics13 areas
Symptom first
Organized by what you can observe, not by product. Symptom, likely causes, what to check first, then a diagnostic procedure.
Step by step
Procedures written to be worked through with the equipment in front of you, including what to verify before you leave.
Latest
Content is revised as field experience corrects it. Each entry carries its published and updated dates.
How a programmable logic controller is physically organized: the chassis, backplane, processor, I/O modules, remote racks, and what those choices mean for wiring, expansion, and failure.
8 min readUpdated Sep 5, 2026
What the processor module does on every scan, how its memory is organized, what the mode switch and status lights mean, and how it faults and recovers.
8 min readUpdated Sep 5, 2026
Sizing the 24 VDC supplies that run a controller and its field devices, separating loads that should not share a supply, and keeping the controller alive through a power event.
8 min readUpdated Sep 5, 2026
Discrete and analog input and output modules, sinking and sourcing, relay and transistor outputs, wiring conventions, and the module diagnostics that find field faults from the panel.
9 min readUpdated Sep 5, 2026
How a controller organizes its data: data tables and tags, the input and output images, the elementary data types and what they hold, and the naming discipline that keeps a program readable years later.
8 min readUpdated Sep 5, 2026
How a controller schedules its work: the continuous task, periodic tasks at a fixed rate, event tasks triggered by something happening, how priority preempts, and where each kind of logic belongs.
7 min readUpdated Sep 5, 2026
Eric Sullivan's personal projects
Software Eric Sullivan is building on his own time. These are personal projects, not products of any employer, and nothing here is available unless its status says so.
Engineering · Drawings · Estimating
A Personal Project of Eric Sullivan
A cloud engineering drawing environment being built to combine drawing review, markup, takeoff, symbol libraries, control-system design, and estimating.
Estimating · Procurement
A Personal Project of Eric Sullivan
A platform under development for project discovery, bid document analysis, scope extraction, specification review, and opportunity management.
Document Intelligence
A Personal Project of Eric Sullivan
A document application under development for organizing, searching, and understanding critical project and technical information.
A Personal Project of Eric Sullivan
About
CurryControls.com is an independent technical knowledge and project website registered and managed by Eric Sullivan.
The current registration was independently made by Eric Sullivan in 2025 after the prior registration expired, completed the domain deletion process, and became publicly available.
The current site contains new technical and project content and is not affiliated with Curry Controls Company, Revere Control Systems, Inc., S.J. Electro Systems, LLC, or General Control Systems, Inc.
CurryControls.com is being developed as an independent technical knowledge resource focused on control systems, PLC programming, SCADA, HMI systems, instrumentation, control panels, industrial networking, telemetry, OT cybersecurity, troubleshooting, and water and wastewater automation.
Direct contact
Reach Eric Sullivan directly about anything on this site, a controls or automation topic, or one of his personal projects.