IT and OT Support for Manufacturers: Converged Infrastructure, Continuous Operations

The OT-IT Convergence Problem in Manufacturing

For most of the past three decades, manufacturing organizations maintained a clean architectural separation between operational technology — the PLCs, SCADA systems, historians, and HMIs that run production — and information technology — the servers, endpoints, M365 tenants, and ERP systems that run the business. Air gaps, or the assumption of air gaps, provided a measure of security through isolation.
That architecture is now largely historical. The push for operational efficiency, real-time production analytics, remote equipment monitoring, and supply chain integration has connected OT networks to IT networks in most mid-market manufacturing environments. The productivity gains are real and measurable. The security exposure created at those connection points is equally real and frequently unmeasured.
The consequence is a threat surface that spans both domains simultaneously. A phishing email that compromises a corporate endpoint can move laterally into an OT network segment if segmentation controls are inadequate. A vulnerability in an internet-connected industrial device can provide an adversary with a pivot point into corporate systems. Ransomware targeting manufacturing environments is designed to encrypt both IT file systems and OT process data, maximizing production disruption to increase leverage for ransom demands.
Armorstack’s answer is converged coverage: CORE managed IT infrastructure and SENTRY cybersecurity operating across both the IT and OT environments under a single operational framework, with CITADEL physical security integrated into the same picture.

IT Services Across the Manufacturing Environment

Enterprise IT Operations

Armorstack’s CORE managed IT platform covers the full enterprise IT stack: endpoint management across office and shop floor workstations, Microsoft 365 governance, ERP system infrastructure support, help desk for production and administrative staff, backup and disaster recovery, and patch management that accounts for the change-control constraints typical in manufacturing environments. Patch cycles in manufacturing require coordination with production schedules — a critical patch cannot be applied to a workstation running an active production process without a planned maintenance window. Armorstack’s change management process is built for that operational reality.

OT Network Visibility and Monitoring

Armorstack deploys passive OT network monitoring aligned to NIST SP 800-82 guidelines for industrial control system security. Passive monitoring is critical in OT environments because active scanning can disrupt industrial protocols and cause unintended equipment behavior. The monitoring solution inventories OT assets — PLCs, HMIs, historians, network switches in the plant floor segment — establishes communication baselines, and alerts on anomalous behavior without injecting traffic that could destabilize production systems.
This OT telemetry feeds into SENTRY’s managed detection and response platform, where analysts with industrial security expertise correlate OT events with IT signals. An unusual authentication attempt on a corporate domain controller that coincides with anomalous polling behavior on an OT historian is a cross-domain indicator that a siloed security model would miss entirely.

Network Segmentation and Architecture

Proper OT-IT segmentation is the foundational control that limits lateral movement between domains. Armorstack’s CORE infrastructure team designs and implements segmentation architectures that follow the Purdue Model reference framework: separating enterprise IT (Levels 4-5) from manufacturing operations systems (Level 3), process control (Level 2), and field devices (Levels 0-1) through firewalls, demilitarized zones, and access control policies that govern what crosses each boundary and under what conditions.
Segmentation architecture is not a one-time design exercise. As manufacturers add new connected equipment, integrate new suppliers, or deploy new production analytics systems, the architecture must be evaluated and updated. Armorstack’s ongoing infrastructure management includes periodic segmentation reviews as a standard operational deliverable.

Endpoint Management for Mixed Environments

Manufacturing IT environments contain a mix of current-generation managed endpoints, legacy Windows systems supporting production equipment that cannot be upgraded without vendor certification, and purpose-built industrial terminals that fall outside standard endpoint management tooling. Armorstack’s endpoint strategy accounts for this heterogeneity: modern endpoints enrolled in Intune with full compliance policy enforcement, legacy systems compensated through network-level controls and enhanced monitoring, and industrial terminals mapped as monitored assets with defined communication boundaries even where agent-based management is not feasible.

Physical Security Convergence: CITADEL in Manufacturing

Physical access to OT equipment is a cybersecurity control, not merely a facilities concern. An adversary with physical access to a PLC, historian, or network switch in an OT segment can bypass most logical security controls. Armorstack’s CITADEL portfolio brings access control and video intelligence into the same operational framework as CORE and SENTRY — so that a badge access event in the control room and a concurrent anomaly on the OT network are correlated in real time rather than investigated separately by different teams days later.

Compliance for Defense and Regulated Manufacturers

Defense subcontractors handling Controlled Unclassified Information face CMMC 2.0 certification requirements that intersect directly with their IT and OT infrastructure. The CMMC compliance pathway begins with an accurate asset inventory that includes OT systems touching the CUI boundary — a requirement that many defense manufacturers underestimate. Armorstack’s VERITY advisory layer builds the System Security Plan and evidence archive that C3PAO assessors examine, while CORE and SENTRY implement and monitor the controls the plan describes.
For manufacturers in food, pharmaceutical, automotive, or other regulated sectors, Armorstack’s VERITY advisory applies the relevant framework — NIST CSF 2.0, ISO 27001, SOC 2 — across the full OT-IT environment, producing compliance posture documentation that reflects actual operational conditions rather than a theoretical control set.

Why Manufacturing Organizations Choose Armorstack

The core reason is converged accountability. Most IT providers stop at the IT-OT boundary. Most OT security vendors do not manage enterprise IT. Armorstack bridges both domains under a single managed intelligence framework — so the seam that creates the most significant risk in a manufacturing environment is the one place where both teams are actively looking, rather than the place neither team can see.
The 90-Day Proof is the starting point. Within the first thirty days, Armorstack produces an OT-IT convergence assessment that maps your current architecture, identifies segmentation gaps, inventories OT assets, and establishes monitoring coverage across both domains. The assessment is actionable — not a findings report that requires additional scoping to implement.
Organizations also considering vendor rationalization should review the IT vendor consolidation and Integration Tax pages to understand how consolidating your IT and OT coverage under a single provider eliminates coordination overhead at the most critical operational boundary in your environment.