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OT Security

OTSecurityOperationsCentre

e2e-assure provides 24/7 OT security monitoring for UK critical infrastructure. SC-cleared analysts use the CUMULO platform with passive network monitoring to detect threats across SCADA, ICS, and industrial control systems without disrupting operations. UK-sovereign, NIS2 compliant, purpose-built for operational technology.

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Trusted By:

  • SC-Cleared UK Analysts
  • 24/7 SOC Coverage
  • NIS2 & IEC 62443 Compliant
  • UK Data Sovereignty
  • Passive Monitoring (Zero Disruption)

Why OT Security Matters

Protect Operational Technology Without Disrupting Operations

Most IT security tools are not built for industrial environments. They misread normal PLC commands as anomalies, generate noise, and miss the threats that matter. e2e-assure’s OT SOC is purpose-built for operational technology, staffed by analysts who understand both cyber threats and industrial processes.

Zero Operational Disruption

Passive monitoring observes network traffic without injecting packets or modifying configurations. Your SCADA and ICS systems continue operating exactly as designed. We watch from the side. No latency, no risk to availability, no changes to process timing.

Full Protocol Visibility

CUMULO understands industrial protocols natively. Modbus, DNP3, OPC-UA, and proprietary protocols from Siemens, Schneider, Honeywell. Protocol-agnostic detection works with legacy environments other tools cannot parse.

Regulatory Compliance Built In

Meet NIS2 and IEC 62443 requirements with monitoring that maps directly to compliance frameworks. Our reporting provides the evidence regulators require, reducing audit burden for your team. Compliance-ready outputs as standard.

OT-Trained UK Analysts

SC-cleared analysts who understand industrial processes, not just cyber threats. Your alerts are triaged by people who know the difference between a legitimate PLC command and a malicious one. That distinction matters more than any technical specification.

Air-Gapped Environment Support

On-premise data diodes and secure one-way data transfer mechanisms enable monitoring even in air-gapped environments. Data leaves the OT network via hardware-enforced unidirectional gateway. No inbound attack vector.

Unified IT/OT Threat Correlation

CUMULO correlates OT network telemetry with EDR, cloud, identity, and log data. Adversaries tracked end-to-end across both IT and OT environments. Eliminates the blind spots where attacks cross domain boundaries.

How It Works

OT Security Monitoring in Four Steps

From deployment to continuous protection, here is how e2e-assure secures your operational technology environment.

1

Deploy OT Sensor

The lightweight telemetry analyser deploys on your existing infrastructure. Virtualised, containerised, bare-metal, or cloud. Zero impact on OT operations.

2

Passive Network Capture

The sensor passively observes all OT network traffic. It identifies devices, protocols, and communication patterns to build a real-time asset inventory.

3

CUMULO Correlates Threats

The proprietary SOC platform correlates OT telemetry with IT signals. EDR, cloud, identity. Detects lateral movement and advanced persistent threats.

4

Analyst Response

SC-cleared OT analysts investigate every alert. Provide actionable guidance. Coordinate response. Threats are contained before they reach safety systems.

OT Security Capabilities

Explore Our OT Security Expertise

Each capability area has a dedicated guide with technical detail, compliance mapping, and practical implementation advice.

IT/OT SOC vs IT-Only SOC

Why standard IT security tools generate false positives in OT environments. How unified detection closes the visibility gap without creating noise.

Read the guide →

OT Threat Landscape 2026

Current attack patterns targeting industrial control systems. From ransomware groups to state-sponsored CNI campaigns. What changed since 2025.

Read the report →

IEC 62443 + NIS2 Compliance

How e2e-assure’s OT monitoring maps to regulatory requirements. Practical guidance for audit readiness. What evidence you need and how to produce it.

Read the guide →

Passive vs Active OT Monitoring

The difference between the two approaches. Why passive monitoring is safer for operational technology. When each method is appropriate.

Read the comparison →

SCADA/ICS Buyer's Guide

What to evaluate when choosing an OT security provider. Protocol support, deployment models, analyst expertise, compliance coverage.

Read the guide →

The CUMULO SOC Platform

How the proprietary platform correlates OT telemetry with IT signals. End-to-end threat visibility across converged environments.

Learn about CUMULO →

Why e2e-assure

What Makes Our OT SOC Different

UK-sovereign operation. All data stays in the UK. All analysts are SC-cleared and UK-based. No offshoring. No third-party data centres outside UK jurisdiction.
OT-native platform. CUMULO supports OT and IIoT environments via e2e-assure’s second-generation telemetry analyser. Technology-agnostic and deployable on-premise, hybrid, or cloud. Adapts to your environment.
Microsoft integration. The SOC Channel App is the UK’s only Microsoft-certified security app for Teams. Real-time alerts, analyst updates, and SLA metrics delivered directly into your Teams channels without requiring a separate portal login.
Cost transparency. CUMULO’s log analytics engine and smart filtering reduce cloud SIEM ingestion costs by up to 80%. Modular SOC capabilities mean you deploy what you need, when you need it, without reconfiguring the entire platform.

Platform Integrations:

Proven Results

OT Security Practice

Real outcomes from UK organisations that chose e2e-assure to protect their operational technology environments.

Case Study

Defence-Aligned Heavy Manufacturing

A UK defence-aligned heavy manufacturer was midway through operational transformation when it became clear their existing security setup could not keep pace. IT-only SOC coverage stopped at the office boundary. OT assets were unmonitored.

e2e-assure deployed the CUMULO Enterprise platform to deliver unified IT/OT SOC coverage across all manufacturing sites, with SC-cleared analysts operating 24/7.

70%

Reduction in mean time to detect

24/7

Unified IT/OT SOC coverage

80%

Reduction in compliance reporting effort

SC-Cleared Personnel

All analysts hold active Security Check clearance

NIS2 Directive Compliant

Monitoring meets Network and Information Security requirements

IEC 62443 Framework

Industrial automation security standard compliance

Over a Decade Protecting CNI

Established UK cyber security provider to critical national infrastructure

Our OT Experts

Written by Industry Practitioners

All OT security content on this hub is authored by named experts with verifiable credentials in operational technology and cyber security.
Dom Carroll, Director of Portfolio at e2e-assure and OT security specialist for UK critical national infrastructure
Dom Carroll

Director of Portfolio

Named author on all OT hub and cluster content. Conference speaker at Infosecurity Europe and CYBERUK. Over 15 years securing industrial control systems across energy, manufacturing, and critical national infrastructure sectors.
Rob Demain, CEO and Founder of e2e-assure, UK-sovereign managed security provider
Rob Demain

CEO, e2e-assure

Executive thought leadership on UK-sovereign security operations. Regular contributor to industry analysis. Podcast guest on cybersecurity topics. Over a decade building and operating SOC platforms for UK government and critical infrastructure clients.

OT Security Glossary

Key OT Security Terms Explained

Clear, expert definitions of operational technology security terminology. Used by security teams, compliance officers, and procurement professionals.
OT SOC
A Security Operations Centre purpose-built for monitoring operational technology networks and industrial control systems.
SCADA Monitoring
Continuous surveillance of Supervisory Control and Data Acquisition systems for anomalous commands and unauthorised access.
Purdue Model
A reference architecture for industrial network segmentation, defining zones from enterprise IT to physical process control.
Passive OT Monitoring
A non-intrusive approach that observes network traffic without sending packets, ensuring zero disruption to OT processes.
ICS Security
The protection of Industrial Control Systems from cyber threats, physical interference, and operational failures.
IT/OT Convergence
The integration of information technology and operational technology networks, creating new attack surfaces and monitoring challenges.
IEC 62443
An international series of standards for securing industrial automation and control systems, covering both processes and technology.
NIS2 Directive
EU regulation expanding cybersecurity requirements for essential and important entities, including operators of critical infrastructure.
View Full OT Glossary (15+ terms) →

OT Security FAQ

What is OT security monitoring and why do organisations need it?
OT security monitoring is continuous surveillance of operational technology networks including SCADA systems, industrial control systems, and programmable logic controllers to detect cyber threats. Organisations need it because OT environments control physical processes in critical infrastructure such as energy, water, manufacturing, and transport. A successful attack can cause physical damage, safety incidents, and operational shutdown.
No. e2e-assure uses passive monitoring, which observes network traffic without injecting packets or modifying configurations. The OT telemetry analyser sits on a network tap or SPAN port with zero impact on the availability, timing, or behaviour of your operational systems. This matters in environments where even milliseconds of latency could affect process safety.
IT SOC tools are designed for enterprise networks and generate false positives in OT environments because they do not understand industrial protocols like Modbus, DNP3, or OPC-UA. An OT SOC uses analysts trained in both cyber security and industrial processes, with detection rules built for operational technology behaviour patterns. e2e-assure’s CUMULO platform provides unified visibility across both IT and OT without the noise.
CUMULO supports all major industrial protocols including Modbus TCP/RTU, DNP3, OPC-UA, BACnet, EtherNet/IP, PROFINET, and S7comm, as well as proprietary protocols from Siemens, Schneider Electric, Honeywell, ABB, and other OT vendors. The approach is protocol-agnostic. If your OT network communicates it, we can monitor it.
Yes. e2e-assure provides on-premise data diodes and secure one-way data transfer mechanisms for air-gapped environments. Monitoring telemetry leaves the OT network through a hardware-enforced unidirectional gateway. There is no inbound path from the monitoring system back to the OT environment. This preserves the air gap while still providing full visibility.
e2e-assure’s OT monitoring directly supports the incident detection, reporting, and risk management requirements under the NIS2 Directive. Reporting maps to IEC 62443 security levels, providing documented evidence of continuous monitoring, threat detection, and response activities that auditors and regulators require. Compliance-ready reporting is standard.
We monitor OT environments across critical national infrastructure sectors including energy and utilities, water treatment, manufacturing, transport, defence, and life sciences. Our analysts have direct experience with the specific operational technology systems used in each sector, from power grid SCADA to pharmaceutical manufacturing control systems.
Initial deployment typically takes two to four weeks depending on the size and complexity of the OT environment. The passive sensor can be deployed on existing infrastructure without scheduled downtime. Asset discovery begins immediately, with full monitoring and alerting active once the baseline period is complete.

Protect Your OT Environment

Not every conversation starts with a request for proposal. If you're still working out what you need, the SCADA/ICS Buyer's Guide walks through what to evaluate. If you're ready to talk to our team, a 15-minute discovery call is the fastest way to understand whether we're a fit for your environment.

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