Every asset known
A live inventory of PLCs, controllers, HMIs, IoT devices and firmware, so you know what you are protecting.
OT & IoT Security
Plant networks you can see, segment and defend, without stopping production.
Many plants still run on flat networks, with unknown PLCs, open vendor access and IoT devices nobody tracks. We map every asset, split the network into Purdue and IEC 62443 zones, broker remote access, and send OT logs to a SIEM your team can act on.
How it works
One reference design, from the enterprise down to the plant floor.
Pick a view: the high-level picture, the Purdue levels, the OT security controls, or the IoT security path.
The big picture on the Purdue model: who connects, the Azure cloud, the enterprise IT levels, the iDMZ, the plant OT levels and an isolated IoT zone, plus the controls that apply at every level.
The industrial network levels, from the enterprise (Level 5) down to the process (Level 0), with the iDMZ between IT and OT and an isolated safety zone.
How traffic moves from the Azure cloud, through the enterprise IT network and the iDMZ, down to the plant cells: logs flow out one way, remote access is brokered and recorded, management runs out of band, and everything else is blocked.
From the device to the cloud: device identity, edge gateways, an isolated IoT zone, secure transport, device management and threat detection.
Business outcomes
From a flat, unknown network to zones you can defend and prove.
We start on the plant floor, not in a slide deck. A site survey finds every device and data flow. Then we design zones and conduits, build them around production windows, and connect OT logs to cloud detection so your team sees threats before they reach a line.
Zones that contain attacks
Purdue levels and IEC 62443 conduits with default-deny between cells, so one infected machine cannot reach the whole plant.
Remote access you control
Vendors and engineers connect with MFA through a broker, and every session is recorded. No direct path into control networks.
Threats you can see
OT, firewall and asset logs reach a cloud SIEM, with full logs kept in immutable storage for audits.
Related services
Capabilities connected to this solution.
These services can be delivered independently or combined into a larger roadmap.
OT & IoT Security
OT and IoT security services: site survey, asset inventory, Purdue and IEC 62443 segmentation, brokered remote access and OT detection in Sentinel.
SIEM / SOAR
Microsoft Sentinel engineering for log collection, KQL detections, MITRE ATT&CK coverage, SOAR playbooks and ingestion cost control.
Security Assessments
Security assessments of identity, cloud configuration, network exposure and detection coverage, with risk-ranked findings and a prioritized fix plan.
Managed Security Operations
Managed security operations for detection tuning, posture reviews, monitoring and incident response under an agreed scope and escalation process.
Industry fit
Built for sites where downtime and safety come first.
Every plant has different control systems, vendors and regulators. We map zones, access and detection to what each site actually runs.
01
02
03
Manufacturing
Segmentation and asset visibility rolled out site by site, around production windows.
Energy & Critical Infrastructure
IT/OT separation and monitoring mapped to NIST SP 800-82, IEC 62443 and, for electric utilities, NERC CIP.
Logistics
Warehouse automation, scanners and IoT sensors kept in their own zones, with outbound-only cloud links.
Delivery path
From a flat network to defended zones, without stopping a line.
Each phase leaves something working and documented, and changes are planned around production.
-
Survey the plant floor, control rooms and network closets. Trace OT data flows and build a full asset and firmware inventory.
- Site survey and asset inventory
- Current-state OT network map
-
Place every device in a Purdue level, define IEC 62443 zones and conduits, and design the iDMZ, remote access and log pipeline.
- Zone and conduit design
- Firewall rule rationale
-
Deploy redundant OT firewalls and switches, brokered remote access, asset monitoring and the out-of-band network, cell by cell.
- Segmented zones live
- Brokered remote access
-
Test zone boundaries, failover, remote access paths and log delivery end to end before handover.
- Segmentation test results
- Log pipeline test report
-
Hand over as-built drawings and runbooks, and keep OT detections tuned as the plant changes.
- As-built drawings and runbooks
- Tuned OT detections
Delivery model
5 Phases
A clear check at every step
Every change is planned around production, and every zone ships with the drawings and rule rationale your team needs to run it.
01
02
03
04
05
Nothing goes live without your sign-off
Each change must pass automatic checks and your review before it reaches production.
No lock-in
Built in your own Git and cloud accounts
Built as code
Terraform or Bicep you can rerun
Runbooks
Your team learns to run it
Ways to start
Start with visibility, then segment and monitor.
OT Security Assessment
2-4 weeksA site survey, asset inventory and risk review that ends in a prioritized, site-by-site roadmap.
Best for: plants that do not yet know what is on their OT networkSegmentation & Remote Access
8-16 weeksPurdue and IEC 62443 zones, an iDMZ, redundant OT firewalls and brokered vendor access.
Best for: flat networks with direct vendor connectionsOT Detection & Monitoring
OngoingOT log pipeline to Microsoft Sentinel, immutable retention and continuous detection tuning.
Best for: sites that need OT threats seen and answered
Technology
Platforms we build on.
Palo Alto Networks
Cisco Industrial Ethernet
Tenable OT Security
XONA
Cribl
Microsoft Sentinel
Azure IoT
Azure Log Analytics
FAQ
Questions we hear from plant and OT security teams.
Short answers to common planning questions for OT & IoT Security.
Will segmentation stop production?
No. Changes are planned around production windows and rolled out cell by cell, with rollback steps ready before each change.
Do you replace our existing PLCs or SCADA?
No. We secure and monitor what you already run. Segmentation, access and detection are built around your current control systems.
How do vendors still get remote access?
Through a broker in the iDMZ, after VPN and MFA. They reach only the assets they need, and every session is recorded.
What about IoT devices and sensors?
IoT devices are inventoried and placed in their own zones. Gateways talk outbound only, so a cloud link never becomes a path into control networks.
Which standards do you follow?
The Purdue Model and ISA/IEC 62443 for zones and conduits, NIST SP 800-82 for OT security practice, and NERC CIP where it applies to electric utilities.
Free first call
Book a 30-minute Call
Not sure what is on your OT network?
Start with an OT security assessment. You get an asset inventory and a site-by-site roadmap.
New to iNET SYSTEMS? Meet our founder, see how we work, read the FAQs or start with an AI Security Readiness Assessment.
