technical controls

Technical controls are security measures implemented and enforced through technology rather than by people or physical barriers. In industrial and regulated environments, they are typically applied to OT and IT systems, networks, applications, and data to manage cybersecurity risks.

What technical controls include

Technical controls commonly refer to:

• Access control mechanisms, such as user authentication, role-based access, least-privilege configurations, and account lockout rules in MES, historians, PLC engineering workstations, and ERP systems.
• Network security, including firewalls, industrial DMZs, VLANs, VPNs, intrusion detection/prevention systems (IDS/IPS), and secure remote access tools.
• System and application hardening, such as secure configuration baselines, patch management tools, application whitelisting, and endpoint protection on HMIs, servers, and engineering laptops.
• Data protection, including encryption at rest and in transit, secure protocols, key management, and tokenization in databases and file repositories.
• Monitoring and logging, such as centralized log collection, SIEM rules, OT/IT monitoring platforms, and alerting for suspicious activity.
• Automated enforcement of policies, such as Data Loss Prevention (DLP) rules, configuration compliance checks, and security orchestration workflows.

In many frameworks, technical controls are also called logical controls because they are implemented through system logic, configuration, and software rather than physical devices or procedural steps.

What technical controls do not include

Technical controls do not typically include:

• Physical controls like fences, locks, badges, and CCTV, even though these may rely on technology.
• Administrative or procedural controls such as policies, SOPs, training, and governance workflows, even when they reference technical requirements.
• Organizational structures like security committees or incident response teams.

Role in industrial and regulated environments

In manufacturing operations, technical controls appear in day-to-day workflows such as:

• Configuring role-based access to MES, batch systems, LIMS, and quality management systems.
• Segmenting OT networks and restricting connectivity between plant-floor devices and corporate IT.
• Implementing secure remote access for vendors and maintenance personnel with logging and session control.
• Applying security patches and configuration baselines to PLCs, DCS nodes, HMIs, and servers where compatible with process and validation constraints.
• Collecting and reviewing security-relevant logs for audit and incident investigation.

These controls are usually mapped to cybersecurity or information security frameworks and are often evaluated during audits, security assessments, and validation activities. Their configuration and operation must be coordinated with production, quality, and compliance requirements.

Common confusion

• Technical vs physical controls: Physical controls are tangible barriers or devices (locks, guards, cages). Technical controls operate through system configuration, software, and network logic. A badge-based door lock is primarily a physical control, while the access control list in the badge system is a technical (logical) control.
• Technical vs administrative controls: Administrative controls are policies, standards, and procedures that define what should be done. Technical controls are the mechanisms that enforce some of those requirements in systems. For example, a password policy is administrative; the system-enforced password rules are technical.

Relation to the four categories of security controls

When security controls are grouped into four categories in industrial environments, technical controls are one category alongside physical, administrative (procedural), and compensating controls. Technical controls focus on automated, system-level enforcement and monitoring of security requirements across OT and IT assets.