Remote Terminal Units
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Standalone RTUs
Self-contained controllers with integrated CPU, I/O, and communications in one enclosure, used at smaller single-purpose sites such as individual wellheads or metering points.
Modular / Rack-Based RTUs
Expandable systems built from a CPU module plus pluggable I/O cards, sized up for larger stations where channel counts and point types grow over time.
Remote / Distributed I/O Systems
Field I/O modules that gather signals near the process and transmit them over a network back to a host RTU, PLC, or controller, reducing field wiring runs across a dispersed facility.
Programmable Logic Controllers (PLCs)
Ruggedized digital controllers running cyclic ladder or IEC 61131-3 logic for local automation; used where deterministic, high-speed control is needed alongside or in place of an RTU.
Edge Gateways / IoT Gateways
Communication-focused devices that aggregate data from RTUs, PLCs, and meters, perform protocol conversion and edge processing, and forward to SCADA historians or cloud platforms via MQTT, OPC UA, or cellular links.
Wireless / Telemetry RTUs
Low-power RTUs integrating cellular, radio, or satellite modems for sites without communication infrastructure, often paired with solar power for autonomous remote operation.
Flow Computer RTUs
RTUs with built-in measurement firmware that calculate corrected gas or liquid volumes per AGA/API algorithms for custody-transfer and allocation metering.
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