PLC, RTU, HMI & DCS Glossary
Controllers and operator interfaces: PLCs, RTUs, HMIs, DCS, I/O, and scan cycles. 162 terms in this topic - each defined in plain English on its own page.
Controllers execute the logic and operator interfaces display it. This topic collects the vocabulary of both: PLC and RTU hardware and programming concepts (scan cycles, ladder logic, timers, latches, I/O modules), the IEC 61131-3 languages, and the HMI design ideas (faceplates, high-performance displays, situational awareness) that determine whether an operator catches a problem or misses it. Programming-language terms sit alongside display terms deliberately - in practice one engineer usually owns both ends of the loop.
162 Terms
What Is an Analog Bar Graph Indicator on an HMI?
A filled bar showing a value against its range with setpoint and alarm marks, read as deviation at a glance.
Read → GlossaryWhat Is an Analog Input Module?
The AI card that digitizes 4-20 mA and voltage signals into scaled engineering values for a PLC or RTU.
Read → GlossaryWhat Does Analog Input Module Resolution (Bits) Mean?
How ADC bits map a 4-20 mA or 0-10 V span into counts, why resolution is not accuracy, and how to size it.
Read → GlossaryWhat Is an Analog Output Module?
The AO card that converts controller commands into 4-20 mA signals driving valves and drives, with readback.
Read → GlossaryWhat Is Analog Output Readback and Hold/Fault-State Behavior?
How a card echoes its own output current and what a valve does on comm loss: hold, safe value, or zero.
Read → GlossaryWhat is an asset management station in a DCS?
The station that reads HART and fieldbus device diagnostics for predictive maintenance, alongside control.
Read → GlossaryWhat Is a Backplane Current Budget and How Do You Calculate It?
How to sum module draws across the backplane rails, add margin, and avoid the brownout faults of a starved rack.
Read → GlossaryHow do you baseline POC runtime?
Record daily runtime, idle, and cycles on a stable well with settings noted, then trend live runtime against it.
Read → GlossaryWhat Is a Bullet Graph for KPIs?
A compact linear chart of measure, target, and range bands for reading actual versus target at a glance.
Read → GlossaryWhat Is I/O Temperature Derating and How Do You Manage Cabinet Heat?
Module ambient limits, per-channel derating curves, summing heat load to size cooling, and catching a hot cabinet.
Read → GlossaryWhat is a charge controller equalization cycle?
A periodic controlled overcharge that balances flooded cells and reverses mild sulfation, but harms sealed batteries.
Read → GlossaryWhat Is a Chemical Injection Controller?
The device, distinct from the pump, that meters dosing to a target and verifies actual injection against setpoint.
Read → GlossaryWhat Are Cold, Warm & Hot Restart in a PLC?
Three PLC startup modes and how they treat retentive memory - deciding whether an RTU resumes or resets.
Read → GlossaryWhat Is a Color-Blind-Safe HMI Palette?
A palette and coding scheme where status never rests on hue alone, so color-deficient operators read it too.
Read → GlossaryHow do you commission a plunger-lift controller cycle?
Prove the arrival sensor, set conservative close and open timers with a non-arrival alarm branch, watch full cycles, and tune one variable at a time.
Read → GlossaryHow do you commission a pump anti-cycling timer?
Set the minimum-run and minimum-off timers from the motor's start limit and the system storage, interlock them into the start-stop logic, then verify they hold.
Read → GlossaryCommunications Watchdog
A comms-fail timer that detects a lost link between SCADA and a device and drives failsafe outputs, alarms, and data invalidation.
Read → GlossaryWhat is a control module in a DCS?
The reusable DCS control object built from function blocks that ties field I/O to a faceplate.
Read → GlossaryWhat is a control processor in a DCS?
The DCS CPU that executes control strategies on a fixed scan, sized to a processor loading budget.
Read → GlossaryWhat Is Control Readback Verification?
Confirming a remote command took effect by reading the resulting state back to close the control loop.
Read → GlossaryHow does controller changeover work in a redundant DCS?
The instant a redundant control processor pair switches, kept bumpless by continuous state sync.
Read → GlossaryWhat is controller detuning?
Deliberately slowing a loop for stability margin against interaction, nonlinearity, and model error.
Read → GlossaryWhat is controller loading in a DCS?
How much of a control processor's scan-time budget its loops consume, and why headroom matters.
Read → GlossaryWhat Is Controller Redundancy?
Paired hot-standby CPUs that synchronize state and fail over bumplessly to keep control running through a fault.
Read → GlossaryWhat is a data highway in a DCS?
The redundant, deterministic DCS backbone between controllers and stations, now largely Ethernet-based.
Read → GlossaryWhat is a graphics hierarchy in a DCS?
The ISA-101 four-level display structure, from plant overview to detail, that shapes operator navigation.
Read → GlossaryWhat is a DCS hot cutover during migration?
Replacing an obsolete control system loop-by-loop while the plant keeps running, avoiding a full shutdown.
Read → GlossaryWhat is the difference between a DCS and a PLC?
A DCS suits continuous integrated process control; a PLC suits fast discrete machine logic.
Read → GlossaryWhat Is a DDC Controller?
The building-automation analog to a PLC: universal I/O, embedded loops, and application-specific vs programmable types.
Read → GlossaryWhat is a deadman timer for remote links?
A timer that drives an RTU or process to a safe state when the SCADA host stops refreshing it over a dead link.
Read → GlossaryWhat Is a Digital Input Module?
The discrete input card that senses on/off contacts, with filter times, voltage groups, and dry/wet wiring.
Read → GlossaryWhat Is a Digital Output Module?
The discrete output card that switches loads, comparing relay, transistor, and triac outputs plus load limits.
Read → GlossaryDiscrete vs Analog I/O
On/off digital signals vs continuous 4-20 mA measurements, DI/DO and AI/AO, and how each maps into a PLC, RTU, and SCADA.
Read → GlossaryWhat Is an HMI Display Hierarchy?
The four-level structure of operator screens that lets an operator drill from plant overview to a single loop.
Read → GlossaryWhat is a navigation breadcrumb on an HMI?
A clickable path indicator that shows where an operator is in the display hierarchy and steps them back up.
Read → GlossaryWhat is a distributed I/O node in a DCS?
A field-mounted I/O drop that digitises signals near the process to cut long home-run wiring.
Read → GlossaryDNP3 Analog Output Block
How a master sends a numeric setpoint with the group 41 object.
Read → GlossaryDNP3 Frozen Counter
How a freeze command snapshots a running total at a single instant.
Read → GlossaryDNP3 Sequence of Events
How time-tagged event objects preserve the order of changes.
Read → GlossaryWhat Is a Dynamic Graphic Object on an HMI?
A symbol bound to live tags that changes colour, fill, rotation, or visibility with process data.
Read → GlossaryWhat Is an Embedded Trend?
The mini sparkline beside a value on a process graphic that reveals its recent trajectory at a glance.
Read → GlossaryWhat is an engineering workstation in a DCS?
The DCS node where control strategies, tags, and graphics are built and downloaded to controllers.
Read → GlossaryWhat Is a Faceplate?
The standardized HMI popup for operating one pump, valve, or control loop.
Read → GlossaryWhat Is a First-Scan Bit in a PLC?
The bit that is TRUE only on a PLC's first scan after RUN, used to initialize registers and set safe defaults.
Read → GlossaryWhat Is a First-Up Alarm?
The first-cause capture that flags which single input actually initiated a cascading trip, tied to sequence of events.
Read → GlossaryHow do I recover a PLC that has faulted or gone to stop?
Read the fault code and type, tell I/O from watchdog and program faults, clear safely, and return to RUN.
Read → GlossaryWhat Is Forcing I/O in a PLC?
Overriding an input or output regardless of field or logic - powerful for commissioning, dangerous if left behind.
Read → GlossaryWhat Is a Function Block Diagram?
The graphical PLC language where logic is drawn as connected blocks - ideal for analog and process control.
Read → GlossaryWhat Is a Gas Lift Intermitter Controller?
A surface controller that cycles a motor valve to inject gas slugs that lift low-rate wells, tuned via SCADA.
Read → GlossaryWhat Is HMI Graphic Clutter?
The visual noise of 3D pipes and decoration that hides the data that matters, and how decluttering fixes it.
Read → GlossaryWhat Is HMI Graphic Consistency?
Same symbol, same interaction, same layout on every screen - the principle that cuts errors and training time.
Read → GlossaryWhat Is a Grayscale High-Performance HMI?
A muted-gray display that reserves bright color for abnormal conditions, so alarms stand out instead of hiding.
Read → GlossaryWhat Is an HMI Group Display?
A Level 2 screen lining up several loops as compact faceplates so a unit is operated as a set.
Read → GlossaryHART Configuration-Changed Counter Explained
The flag and counter that record when a device was reconfigured, so change management can catch silent field edits.
Read → GlossaryWhat Is a High-Density I/O Module and How Do You Terminate It?
32 and 64 point modules, mass-termination connectors, pre-wired cables to swing-arm blocks, and derating tradeoffs.
Read → GlossaryWhat Is a High-Performance HMI?
The display design philosophy of muted graphics and reserved color that speeds operator response to upsets.
Read → GlossaryWhat Is a High-Speed Counter Module?
The HSC card that counts fast pulse trains from encoders and turbine/PD meters, including quadrature direction.
Read → GlossaryWhat is a history module in a DCS?
The DCS node that collects, compresses, and trends process data at the control layer.
Read → GlossaryWhat Is HMI Color Coding?
The rules that reserve saturated color for abnormal states and back it with colorblind-safe redundant coding.
Read → GlossaryWhat is HMI display decluttering?
Techniques like muted statics, layered detail, and data on demand that make abnormal conditions stand out.
Read → GlossaryWhat Is an HMI Navigation Scheme?
How operators move between screens - bars, menus, breadcrumbs, and object links - and why shallow paths matter.
Read → GlossaryWhat Is HMI Situational Awareness?
The graphic techniques - analog displays, embedded trends, deviation indicators - that build operator awareness.
Read → GlossaryWhat Is an HMI Style Guide?
The document and object library that standardizes fonts, colors, indicators, and navigation across every screen.
Read → GlossaryWhat Is HMI Text Legibility?
Sizing type to viewing distance, choosing sans-serif fonts, and setting contrast so screens stay readable.
Read → GlossaryWhat Is a Home Display on an HMI?
The top-level overview screen an operator starts from, showing area status, KPIs, and active alarms at a glance.
Read → GlossaryWhat Is Hot-Swappable I/O and How Does It Work?
How removal and insertion under power lets you replace a failed I/O card without shutting the process down.
Read → GlossaryWhat Is a PLC I/O Image Table?
The frozen snapshot of field I/O the PLC reads at scan start and writes at scan end, and its timing trap.
Read → GlossaryWhat Is an I/O Module?
The cards that connect field wiring to a PLC or RTU, module types for discrete and analog signals, and local vs remote I/O.
Read → GlossaryWhat Do I/O Module Self-Diagnostics and Status LEDs Tell You?
Per-channel open-wire and short-circuit faults, module fault bits, LED meanings, and reading them remotely.
Read → GlossaryIEC 61131 parts overview: beyond 61131-3
The whole IEC 61131 series mapped, from general definitions and equipment tests to communications, functional safety, and application guidelines.
Read → GlossaryWhat Is IEC 61131-3?
The international standard defining the five PLC programming languages, from ladder to structured text.
Read → GlossaryIEC 61131-3 languages: when to use each
A selection guide matching ladder, function block, structured text, sequential function chart, and instruction list to the logic each one expresses best.
Read → GlossaryWhat Are Input Scan and Output Scan?
The scan phases where a PLC reads all inputs and writes all outputs, plus the latency remote I/O adds.
Read → GlossaryWhat Is Instruction List?
The low-level, assembly-like PLC language of IEC 61131-3, now deprecated but still found in legacy code.
Read → GlossaryWhat Is an Interface Level Controller?
The controller that senses the oil-water boundary and drives the water dump to keep both phases clean.
Read → GlossaryWhat Is an Irrigation Scheduling Controller?
Time, volume, and sensor-based modes, master valve and overrides, and scaling from one station to SCADA.
Read → GlossaryWhat Is ISA-101?
The HMI design standard behind high-performance displays: a four-level hierarchy, gray-scale philosophy, and screen lifecycle.
Read → GlossaryWhat are ISA-101 display levels 1 through 4?
The ISA-101.01 four-level display model from area overview to diagnostics, with content-per-level guidance and top-down navigation.
Read → GlossaryWhat are the stages of the ISA-101 HMI lifecycle?
System standards first, then design and implementation to the hierarchy, then operation and maintenance under managed change, looping back.
Read → GlossaryWhat Is the ISA-101 Standard?
The standard governing HMI design and lifecycle, from style guide through operation and maintenance.
Read → GlossaryISA-101 vs EEMUA 191: which HMI reference?
A dedicated display standard versus practical engineering guidance, strongly aligned on high-performance principles and best used together.
Read → GlossaryIsolated or non-isolated analog input?
A selection guide comparing ground-loop immunity, common-mode rejection, noise, and cost for isolated versus non-isolated analog channels.
Read → GlossaryWhat Is an HMI KPI Tile?
The compact widget for one metric with target and trend - the reusable block a KPI dashboard is built from.
Read → GlossaryWhat is a latch and unlatch instruction?
Latch (OTL/set) and unlatch (OTU/reset) hold an output bit on across scans and power cycles until cleared.
Read → GlossaryWhat is a lone worker check-in timer?
A safety countdown a solo worker must reset, or the system auto-escalates a welfare alert to dispatch.
Read → GlossaryMicrogrid Controller Monitoring
The dispatch, mode, and reserve signals that let an operator trust a microgrid controller.
Read → GlossaryWhat Are Modbus Register Types?
The four Modbus tables - coils, discrete inputs, input and holding registers - what's read-only vs read-write, and mapping.
Read → GlossaryWhat Is a Modem Watchdog Auto-Reboot?
How a gateway pings a known host and power-cycles a stalled cellular link to self-heal unattended sites.
Read → GlossaryWhat is a motion controller?
The device that generates trajectories and coordinates multiple axes, commanding the servo drives.
Read → GlossaryWhat is a motor control faceplate on an HMI?
The HMI popup for one motor: run/stop/trip status, start-stop commands, interlocks and permissives, hours-run, and local/remote.
Read → GlossaryWhat is a multistate symbol on an HMI?
An HMI graphic that changes appearance with a discrete tag value to show equipment state through safe color and shape coding.
Read → GlossaryWhat Are NO vs NC Contacts?
Field device state versus the XIC/XIO ladder instructions, and getting fail-safe ESD wiring right.
Read → GlossaryWhat Is Onboard Datalogging at the RTU?
How an RTU timestamps and stores readings in non-volatile memory during outages, then backfills on reconnect.
Read → GlossaryWhat Is a One-Shot Instruction?
Edge-detect logic that pulses for one scan on a transition, for counting once, latching, and snapshots.
Read → GlossaryWhat Is Online Editing a PLC?
Changing logic while the process keeps running via test, assemble, and accept - vital for sites you can't shut down.
Read → GlossaryWhat is an operator station in a DCS?
The run-time DCS window with graphics, faceplates, alarms, and trends and restricted engineering rights.
Read → GlossaryWhat Is an ORP Controller?
The controller that paces oxidant or dechlorination feed using redox potential in millivolts.
Read → GlossaryWhat is controller output rate limiting?
Capping how fast the output moves per scan to protect actuators, and the disturbance-rejection cost.
Read → GlossaryWhat Is Controller Output Saturation?
A controller pinned at 0% or 100% has no authority left; learn what chronic saturation reveals about the plant.
Read → GlossaryWhat is controller output tracking?
How track and initialize modes align a controller's state so it resumes without a bump in cascade and override.
Read → GlossaryWhat Is an HMI Overview Display?
The Level 1 at-a-glance screen showing whole-facility health so operators catch problems before they alarm.
Read → GlossaryWhat is a persistent navigation toolbar on an HMI?
The always-visible frame of home, back, level, and alarm controls that surrounds every HMI display.
Read → GlossaryWhat is a PID controller faceplate on an HMI?
The HMI popup for one control loop showing PV, SP, and OP, auto/manual/cascade mode, setpoint entry, and an output bar.
Read → GlossaryWhat are the parallel, standard, and series PID forms?
Three PID structures, why identical tuning numbers behave differently, and the conversions to move between them.
Read → GlossaryWhat Is a PLC Backplane?
The chassis board that seats and powers modules and carries the internal data bus between CPU and I/O.
Read → GlossaryWhat is PLC Configuration Backup?
Keeping verified copies of controller logic so a bricked or tampered PLC can be restored to a known-good state.
Read → GlossaryWhat Is a PLC Counter?
CTU and CTD instructions that tally discrete events, and when to use a hardware high-speed counter instead.
Read → GlossaryWhat Is a PLC Data Block?
Organized memory for setpoints, recipes, and function-block data - global versus instance data blocks.
Read → GlossaryWhat Is a PLC Fault Routine?
How PLCs trap recoverable and CPU-halting faults so a remote RTU need not go offline over a bad calc.
Read → GlossaryWhat Is a PLC I/O Card?
The input and output modules that connect a PLC to field sensors and actuators, discrete vs analog, and the path to SCADA.
Read → GlossaryWhat Are PLC Tasks?
Continuous, periodic, and event tasks that schedule controller code, and why periodic tasks keep math timely.
Read → GlossaryWhat Is a Plunger Lift Controller?
The wellhead field controller that reads casing pressure and plunger arrival to sequence the motor valve on a gas well.
Read → GlossaryWhat Are Pneumatic Controller Emissions?
How gas-driven instrument controllers vent natural gas - high-bleed, low-bleed, and intermittent types.
Read → GlossaryHow Does Pump-Off Controller Timer Mode Work?
The percent-runtime and idle-time configuration that cycles a rod pump on preset intervals instead of load sensing.
Read → GlossaryWhat is the difference between a popup faceplate and a full detail display?
The small in-context faceplate for quick control versus the full-screen detail display with every parameter, trend, and limit.
Read → GlossaryWhat is a primary control display?
The level 2 working screen an operator runs a unit from, blending graphic, controls, trends, and alarms.
Read → GlossaryWhat Is a Process Graphic?
The interactive schematic operating screen with live values and controls that an operator runs the process from.
Read → GlossaryPROFIBUS DP watchdog
The fail-safe timeout on a silent master, plus the min interval that paces polling.
Read → GlossaryPROFINET IO controller, device, and supervisor
The three PROFINET IO roles - who initiates traffic, who answers, and who configures.
Read → GlossaryWhat Is a Program Organization Unit?
The IEC 61131-3 code building block - Program, Function, Function Block - behind reusable wellsite logic.
Read → GlossaryWhat Is a Programmable Automation Controller (PAC)?
The advanced tag-based controller that runs logic, process, motion, and comms where a classic PLC stops.
Read → GlossaryWhat Is a Pump-Off Controller?
The rod-lift controller that spots a pumped-off well from load data and cycles the unit to protect it.
Read → GlossaryWhat is the difference between a PWM and MPPT charge controller?
A head-to-head guide: the harvest gain, panel-voltage matching, and when PWM or MPPT is the right pick for a remote site.
Read → GlossaryWhat Is a Radar Chart on an HMI?
A multi-axis polar chart that turns several related variables into a shape signature to compare.
Read → GlossaryWhat Is Remote I/O?
Field-located I/O racks networked back to the controller through drops and adapters to cut wiring and cost.
Read → GlossaryWhat Is Retentive Memory in a PLC?
The controller data that survives a power cycle - how retention works and why the wrong choice loses totals.
Read → GlossaryWhat Is a Retentive Timer (RTO)?
The timer that keeps its accumulated value when its rung goes false - and needs an explicit reset.
Read → GlossaryWhat Is Controller Robustness (Gain and Phase Margin)?
How much drift a loop can take before it goes unstable, measured by gain and phase margin, and why robust wins.
Read → GlossaryWhat is sleep mode in a low-power RTU?
The microamp deep-sleep state a remote unit sits in between readings, where sleep current, not active draw, sets battery life.
Read → GlossaryWhat Is a Safety PLC?
The SIL-rated safety controller with dual processors, self-diagnostics, and a fail-safe state that runs SIS logic.
Read → GlossaryWhat Is Scan Time?
The PLC scan cycle of reading inputs, solving logic, and writing outputs, why it matters, and how it differs from SCADA poll rate.
Read → GlossaryWhat Is a Seal-In Rung?
The self-holding start/stop pattern behind motor and pump logic, versus latch/unlatch coils.
Read → GlossaryWhat is a sequence of events recorder?
A subsystem capturing time-synced events at millisecond resolution to reconstruct the order of a trip.
Read → GlossaryWhat Is a Sequence-of-Events Display?
A millisecond-stamped, time-ordered list of digital events that reveals the true first cause of a trip.
Read → GlossaryHow do you set a failover hold-down timer?
Pick detection and dwell times that ride out blips but switch on real outages, use asymmetric failback, and test both edges.
Read → GlossaryHow do you set up a gateway watchdog reboot?
Watch host reachability, build a recovery ladder before rebooting, cap reboot loops, set sane timers, and test self-recovery.
Read → GlossaryWhat is the difference between a set-dominant and reset-dominant latch?
Which wins when set and reset are both true. Reset-dominant is the safe default so trips beat start commands.
Read → GlossaryWhat Is Sinking vs Sourcing I/O?
The wiring-direction rule behind PNP/NPN sensors and how to match a sensor to a PLC input card.
Read → GlossaryWhat Is Situational Awareness?
The operator's live grasp of plant state and where it is heading.
Read → GlossaryThe HMI screens are slow: where is the bottleneck?
Isolate the dragging layer: a heavy graphic, an overloaded data pipeline, or one slow client or connection.
Read → GlossaryWhat Is the Difference Between a Smart Camera and a Vision Controller?
A smart camera runs the inspection onboard; a vision controller centralizes processing for many cameras.
Read → GlossaryWhat Is a Soft Key on an HMI?
An on-screen button that navigates or acts, forming the consistent bar that ties the display hierarchy together.
Read → GlossaryWhat Is a Solar Charge Controller?
The device between panel and battery that regulates charge - PWM vs MPPT - and disconnects before damage.
Read → GlossaryWhat Is a Sparkline on an HMI?
A word-sized inline trend beside a value that shows recent history and direction at a glance.
Read → GlossaryWhat is spatial dedication in HMI design?
Keeping alarms, navigation, and values in fixed screen regions on every display to build operator muscle memory.
Read → GlossaryWhat is a state machine in PLC programming?
One state variable plus a branch per state runs sequences cleanly, with entry, exit, and defined transitions.
Read → GlossaryWhat Is Structured Text?
The high-level, Pascal-like PLC language for complex calculations and algorithms that ladder handles poorly.
Read → GlossaryWhat Is a Graphic Symbol Library on an HMI?
A curated kit of reusable equipment symbols where editing the master updates every instance.
Read → GlossaryWhat Is Symbolic vs Absolute PLC Addressing?
How readable tag names replace codes like I0.0, and how aliasing maps symbols to physical I/O.
Read → GlossaryWhat Is HMI Touch Target Design?
Sizing, spacing, and confirmation for touchscreen controls so operators, even gloved ones, do not mis-tap.
Read → GlossaryWhat Is Trapezoidal Integration in a PLC?
The rectangular versus trapezoidal math behind a totalizer, and why the trapezoid halves ramp error.
Read → GlossaryWhat is a safe controller tuning workflow?
Baseline, manual, bump test, model fit, calculate, trim, and document - the safe end-to-end procedure.
Read → GlossaryWhat is universal I/O in a DCS?
A DCS channel software-set to AI, AO, DI, or DO, cutting marshalling and the cost of late changes.
Read → GlossaryWhat Is a User-Defined Data Type?
Custom structures that bundle related tags, like a Well UDT, for consistent code and faceplates at scale.
Read → GlossaryWhat is a valve control faceplate on an HMI?
The HMI popup for one valve: open/close/throttle commands, commanded-vs-actual position, travel and limit feedback, fault status.
Read → GlossaryHow do you verify charge controller setpoints?
Read back every stage voltage, compare against the battery datasheet, and meter a real charge cycle at the terminals.
Read → GlossaryHow do you verify a POC load signal?
Check the load cell zero, span, and polarity, then confirm the running load band matches the expected fluid load.
Read → GlossaryHow do you verify a POC position signal?
Confirm zero at bottom and full at top, direction rising on the upstroke, smooth linearity, and one count per stroke.
Read → GlossaryWhat is a vapor pressure deficit (VPD) controller in a greenhouse?
The climate function that holds greenhouse VPD in a band with heating, venting, fogging and screens.
Read → GlossaryWhat Is a Watchdog Timer?
How a timer that must be reset detects a failed controller or lost communications and forces a safe state in automation.
Read → GlossaryWhat Is a Web-Based HMI?
A browser-rendered HTML5 interface with no client install, why it is displacing native HMI clients, and the tradeoffs.
Read → GlossaryWhat is Wobbe index control for fuel gas blending?
Closed-loop blending or ballasting that holds a fuel's Wobbe inside a burner or turbine's acceptance band.
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