TechKnowSurge
TechKnowSurge Catalog Videos Remote Terminal Unit (RTU)
VideoSecurityFree

Remote Terminal Unit (RTU)

Remote terminal units (RTUs) are field-deployed industrial controllers used in SCADA environments to manage equipment in remote or infrastructure-sparse locations. Though similar to PLCs, RTUs are optimized for distributed deployments where centralized server access is unavailable.

⚑ Complete this video to capture a CTF flag worth 1 point.

About this video

Remote terminal units (RTUs) are industrial control devices that operate within SCADA environments alongside programmable logic controllers (PLCs). Both device types receive instructions from a SCADA system and are responsible for managing physical equipment on the ground, and today their capabilities overlap enough that they are often used interchangeably in modern deployments. Historically, PLCs have been the more advanced option, offering greater programmability and processing capability, while RTUs have leaned toward simpler, more streamlined designs suited to specific operational needs. The defining characteristic of an RTU is its suitability for remote or distributed environments. In scenarios such as oil extraction or refinery operations, equipment may be spread across large geographic areas far from any central infrastructure. RTUs are deployed directly in the field to maintain local control over that equipment, operating independently when a connection to a central server is unavailable or impractical. This makes them a critical component in industrial control system architectures where reliability and reach matter as much as processing sophistication.

What you'll learn

What's covered

Remote Terminal Units (RTUs)

Key terms

Remote Terminal Unit
RTU
Remote Terminal Unit is a field device in OT/ICS environments that collects sensor data and executes commands; RTU compromise can allow unauthorized control of physical infrastructure.
Programmable Logic Controller
PLC
Programmable Logic Controller is an industrial computer used to automate machinery and processes; PLC security is a cornerstone of OT protection as exploitation can cause physical damage.
Supervisory Control and Data Acquisition
SCADA
Supervisory Control and Data Acquisition is a system architecture used in critical infrastructure to collect sensor data and issue real-time control commands; SCADA security failures can result in physical damage to industrial equipment and facilities.

Topics

Remote Terminal Unit Scada Industrial Control Systems Programmable Logic Controller Operational Technology

Transcript

RTUs Alongside PLCs

Similar to a PLC, we have an RTU, or remote terminal unit.

In this scenario, let's say we have a factory floor and we have a SCADA controller right here. So a SCADA system that is delivering instructions to these right here, and these are either PLCs or RTUs. I mentioned PLCs are programmable logic controllers, and they are programmable logic controllers because we can program them to control the different pieces of equipment.

Well, there is this other type of controller here called RTUs. A remote terminal unit, or RTU, is very similar to a PLC. A PLC is designed to control equipment; same thing with a remote terminal unit. In fact, nowadays they're somewhat interchangeable. There is quite a bit of overlap between what RTUs do and what PLCs do. PLCs are designed to be a little bit more advanced, historically speaking at least; remote terminal units are a little more basic in their nature.

Where RTUs Are Used

Essentially, the key to where we use a remote terminal unit is when we're controlling equipment that is more remote. So in this case right here, we've got maybe some oil pumps, maybe some sort of oil refineries or something like that, where there are some processes that need to be controlled. Now we don't always have access to some central server, so this doesn't necessarily exist. So what we do is we program these now to control the equipment. So this is a remote terminal unit, which we can use out in the field to control equipment that's out there in the field.

About TechKnowSurge

TechKnowSurge builds IT and cybersecurity professionals through hands-on, concept-first training built around real understanding — not memorization. Free interactive tools, structured programs, and 25+ years of real-world experience, all in one place.

Explore free tools and programs →