IEC 62443 | OT Cybersecurity

IEC 62443 Hardening

Achieve IEC 62443 Compliance with Zero Production Disruption.

Nuwair Systems applies the IEC 62443 industrial cybersecurity standard to your OT environment — hardening PLCs, SCADA systems, and network architecture against cyber threats without touching production schedules. Gap assessment, remediation roadmap, and implementation delivered in a single engagement.

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SL2+

Target security level achieved

0 hrs

Production lost during hardening

100%

Asset inventory coverage

6 wks

Gap-to-remediation timeline

What We Deliver

The four delivery pillars behind every IEC 62443 Hardening engagement.

IEC 62443 Gap Assessment

Scored assessment against 62443-2-1 and 62443-3-3 with a prioritised remediation backlog as the final deliverable.

OT Asset Discovery

Passive scanning identifies every PLC, HMI, and historian on the OT network without disrupting live processes.

Network Segmentation (Purdue Model)

Zone and conduit design, firewall rules, and DMZ configuration enforcing Purdue Model boundaries.

OT Security Monitoring

Passive OT traffic monitoring feeds anomaly alerts into your SIEM without control-layer latency impact.

Choose Your Package

Three tiers designed to match your scope and ambition.

OT Security Assessment

Gap Analysis & Roadmap

IEC 62443-2-1 & 62443-3-3 Gap AssessmentAssessment
Passive OT Asset Discovery & InventoryAssessment
Risk-Prioritised Remediation RoadmapAssessment
Executive Findings BriefingAssessment

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IEC 62443 Implementation

SL1 → SL2 Hardening

Purdue Model Network SegmentationHardening
SCADA & PLC Device HardeningHardening
Secure Remote Access (PAW + Session Recording)Hardening
Firewall Rule Base OptimisationHardening
Passive OT Traffic Monitoring (Claroty / Dragos)Monitoring
SIEM Integration for OT AlertsMonitoring

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Certification-Ready Program

SL2 → SL3 + Audit Support

Advanced Network Segmentation (All Purdue Layers)Hardening
Continuous Vulnerability Management (OT CVE Feeds)Monitoring
OT SOC Integration + 24/7 Alert TriageMonitoring
IEC 62443 Evidence Package for Third-Party AuditAssessment
IECEE Certification Audit SupportAssessment
Dedicated OT Security PractitionerHardening

Pursue Certification

Frequently Asked Questions

Will the assessment interrupt production?: No. The assessment uses passive monitoring and physical walk-downs only. No active scanning tools that could disrupt PLCs or safety systems are used.
Do you support ISA/IEC 62443 certification audits?: Yes. We prepare evidence packages and work with IECEE-accredited certification bodies to support third-party audits.
Which SL targets are realistic?: Most manufacturing environments achieve SL1→SL2 in the first engagement. SL3 requires additional investment and is typically pursued by critical infrastructure operators.

Ready to get started?

Talk to a Nuwair Systems specialist and get a tailored proposal within 48 hours.

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IEC 62443 Hardening

Achieve IEC 62443 Compliance with Zero Production Disruption.

Frequently Asked Questions

Will the assessment interrupt production?

No. The assessment uses passive monitoring and physical walk-downs only. No active scanning tools that could disrupt PLCs or safety systems are used.

Do you support ISA/IEC 62443 certification audits?

Yes. We prepare evidence packages and work with IECEE-accredited certification bodies to support third-party audits.

Which SL targets are realistic?

Most manufacturing environments achieve SL1→SL2 in the first engagement. SL3 requires additional investment and is typically pursued by critical infrastructure operators.

IEC 62443 Hardening

What We Deliver

IEC 62443 Gap Assessment

OT Asset Discovery

Network Segmentation (Purdue Model)

OT Security Monitoring

Choose Your Package

OT Security Assessment

IEC 62443 Implementation

Certification-Ready Program

Frequently Asked Questions

Ready to get started?

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IEC 62443 Hardening

What We Deliver

IEC 62443 Gap Assessment

OT Asset Discovery

Network Segmentation (Purdue Model)

OT Security Monitoring

Choose Your Package

OT Security Assessment

IEC 62443 Implementation

Certification-Ready Program

Frequently Asked Questions

Ready to get started?