OT Cybersecurity for Manufacturers
Where IT Meets the Plant Floor – Without Stopping Production
Your PLCs, SCADA systems, and HMIs don’t work like the computers in your corporate office – and your cybersecurity program shouldn’t treat them like they do. NBIT designs, segments, and defends the converged IT/OT environments that keep U.S. manufacturers and food & beverage plants running.
Your Operational Technology Is Now Your Biggest Attack Surface
For decades, the plant floor was air-gapped. PLCs, HMIs, and SCADA systems lived on isolated networks, unreachable from the corporate side. That world is gone.
Today, your line equipment talks to your ERP. Your MES pushes production data to the cloud. Vendors VPN in for remote diagnostics. IIoT sensors stream telemetry to dashboards your CFO checks on her phone. Every one of those connections is a potential entry point – and every one bypasses the assumptions your control engineers made when the equipment was specified ten or twenty years ago.
Manufacturing has been the #1 most-attacked industry for ransomware four years running. Attackers know that a stopped line costs more per hour than the ransom – and they price accordingly.
#1
Most-attacked industry for ransomware (IBM X-Force, 2024)
$4.7M
Average cost of an industrial ransomware incident
70%
OT vulnerabilities flagged by CISA with no patch available
What Is IT/OT Convergence?
IT/OT Convergence Explained
IT/OT convergence is the integration of operational technology – the PLCs, SCADA systems, HMIs, robotics, and industrial control systems that run a plant floor – with information technology systems like ERP, MES, cloud analytics, and corporate networks. Done well, it gives manufacturers real-time visibility into production, lower downtime, and predictive maintenance. Done poorly, it exposes fragile control systems to the same threats targeting corporate email – without any of the patching cadence or endpoint protection IT teams rely on.
The hard part isn’t the connection. The hard part is keeping the production network reliable, deterministic, and safe while still moving data to the systems that need it.
Our Services
How NBIT Secures Converged IT/OT Environments
OT Network Segmentation & Purdue Model Architecture
We design segmentation that follows ISA-95 / Purdue Reference Model zones – Level 0 (sensors) through Level 5 (enterprise) – with enforced boundaries between OT, DMZ, and IT layers. Industrial firewalls, VLAN isolation, and explicit allow-lists replace the flat networks that let ransomware traverse from a phished email straight to a SCADA HMI.
Industrial Asset Discovery & Inventory
You can’t protect what you can’t see. We deploy passive OT asset discovery to build a complete inventory of every PLC, drive, robot, sensor, and engineering workstation – including firmware versions, communication protocols (Modbus, EtherNet/IP, PROFINET, OPC UA), and patch status. No active scans that could crash a control system.
OT Vulnerability Management & CISA ICS Advisory Tracking
We monitor CISA ICS-CERT advisories daily and map every disclosed vulnerability against your asset inventory. Where patches exist, we coordinate scheduled maintenance windows. Where they don’t – the majority of OT CVEs – we deploy compensating controls so unpatchable equipment doesn’t become an open door.
Secure Remote Access for Vendors & Engineers
We replace ad-hoc VPNs and exposed RDP with brokered, MFA-protected, session-recorded remote access. Vendors get the connection they need; you get an audit log of every command they ran. Time-limited sessions, access scoped to specific systems only.
24/7 OT Monitoring & Incident Response
Our SOC monitors your converged environment around the clock – IT endpoints, OT network traffic, identity, and cloud – with alert triage tuned for industrial protocols. When something looks wrong on the plant floor, we have a documented runbook that doesn’t start with “shut everything down.”
Compliance Mapping (NIST 800-82, IEC 62443, CMMC, FSMA 204)
Every control we deploy maps back to the framework that matters for your contracts. For DoD-adjacent manufacturers: NIST 800-171 and CMMC 2.0. For ICS hardening: NIST 800-82 Rev. 3. For F&B manufacturers: FSMA 204 traceability records that depend on uptime and data integrity.
Why Now
Three Things That Changed in the Last 24 Months
OT security used to be optional. It isn’t anymore. Three converging forces are making IT/OT convergence security a board-level issue for manufacturers.
Already have an internal IT team? Our co-managed IT model gives your team the OT specialists, 24/7 SOC, and tooling stack you can’t justify hiring in-house – while leaving day-to-day decisions and strategy in your hands.
CISA Cybersecurity Performance Goals
The CPGs explicitly call out OT segmentation, asset inventory, and account security as baseline expectations – and prime contractors are flowing them down to suppliers.
Cyber Insurance Underwriting Got Serious About OT
Carriers now require documented network segmentation between IT and OT, MFA on every remote-access path into the plant, and tested incident response plans. “We have antivirus” no longer renews a policy.
The IT/OT Skill Gap Got Wider
Most internal IT teams have never been trained on industrial protocols, and most plant engineers don’t speak TCP/IP fluently. Without a partner who lives in both worlds, the boundary between them becomes your weakest point.
Industries We Serve
Built for the Industries We Serve
Discrete & Process Manufacturing
From CNC shops to chemical plants, we secure the SCADA, MES, and ERP integrations that keep production data flowing without exposing the line.
See Manufacturing IT services →Food & Beverage Manufacturing
Cold-chain monitoring, batch records, and FSMA 204 traceability all depend on a converged network that doesn’t go down.
See Food & Beverage IT services →Logistics & Distribution
WMS, automated material handling, and IIoT-enabled fleets create the same convergence challenges on a different floor plan.
See Logistics IT services →How We Engage
From First Call to Steady-State
OT Risk Assessment
Asset discovery, network mapping, and gap analysis. 2–3 weeks. You get a findings report whether or not you hire us.
Architecture & Design
Purdue-aligned zone design, firewall rule sets, remote-access redesign. 4–6 weeks.
Implementation
Deployed with your control engineers and vendors. Zero unplanned downtime is the goal. 8–16 weeks.
24/7 Operations
Monitoring, monthly reporting, quarterly tabletop exercises, and annual reassessment as your environment evolves.
FAQ
IT/OT Cybersecurity Questions Manufacturers Ask Us
What is OT security, and how is it different from IT security?
OT security protects the industrial control systems that physically run a plant – PLCs, SCADA, HMIs, robotics, and the networks connecting them. IT security protects data and computing systems. The differences matter: OT systems often run for 15–25 years on legacy operating systems that can’t be patched, can’t tolerate the network scans IT teams use routinely, and prioritize availability and safety over confidentiality. An IT-only security program applied to OT will either miss real risks or break production.
What is the Purdue Model and why does it matter?
The Purdue Reference Model is the standard architecture for segmenting industrial networks into hierarchical levels – from physical sensors (Level 0) up through enterprise systems (Level 5) – with controlled boundaries between each level. It’s the de facto blueprint cited in IEC 62443 and NIST 800-82. Following it is the fastest way to reduce the blast radius of an IT-side breach.
Will OT security tools crash our production line?
Not if they’re chosen and deployed correctly. We exclusively use passive OT monitoring tools that observe network traffic without interrogating control systems. Active scans – the kind IT vulnerability scanners run by default – can absolutely crash legacy PLCs, which is why we don’t run them on OT segments.
Do we have to replace our existing equipment to do this?
No. The whole point of segmentation, monitoring, and compensating controls is that they wrap around equipment you can’t change. We routinely secure environments with PLCs running firmware older than the engineers who installed them.
How does this map to CMMC, NIST 800-171, or our cyber-insurance application?
Every control we deploy is documented against the framework that applies to your business. For CMMC 2.0 Level 2 work, our deliverables include the System Security Plan artifacts assessors expect to see. For cyber-insurance renewals, we provide the network diagrams, MFA evidence, and segmentation attestations that carriers now require.
How much does this cost?
It depends on plant size, the number of OT assets, and your current state. A small single-site manufacturer might invest $25–50K in initial assessment and segmentation, then a predictable monthly co-managed fee. A multi-site operation with hundreds of PLCs is a different conversation. We quote based on observed scope after the initial assessment – and the assessment itself is fixed-fee so there are no surprises.
Talk to Someone Who Actually Speaks Both Languages
Most MSPs sell you “cybersecurity.” A few sell you “OT security.” We do both, in the same conversation – because in 2026, you can’t credibly do one without the other.