What kind of documentation do asset owners expect with IEC 62443-aligned components?

Asset owners usually expect that any component claimed to be aligned with IEC 62443 comes with security-relevant documentation that is specific, versioned, and usable in their own risk, validation, and change-control processes. A generic marketing datasheet is not sufficient.

1. Scope, assumptions, and intended use

Asset owners expect clear statements on:

• Which part(s) of IEC 62443 the component is designed to align with (for example 62443-3-3, 62443-4-1, 62443-4-2), without implying formal certification if it does not exist.
• The intended role of the component in an industrial automation and control system (IACS), for example field device, PLC, gateway, HMI, engineering workstation, or security appliance.
• Expected deployment context and assumptions, for example required network zoning, external protections (firewalls, DMZs), physical access control, or dependence on external monitoring.
• Security level assumptions, for example which IEC 62443 security level (SL) the design is targeting under specified conditions, and which threats are explicitly out of scope.

Asset owners use this information to assess fit for their own zones and conduits and to avoid overestimating the component’s security properties.

2. Security feature and capability description

Beyond basic functional datasheets, asset owners typically expect a security-focused description that is detailed enough to support architecture and risk assessments, including:

• Authentication and authorization capabilities, for example account models, role-based access control, supported identity providers, password policies, and local vs centralized account handling.
• Communication protections, for example supported protocols and versions, encryption options, certificate handling, key lengths, and any use of insecure or legacy protocols.
• Data protection features, for example protection of security parameters, secure storage of secrets, logging of access to sensitive functions, and options for data at rest protection if present.
• System hardening features, for example services that can be disabled, unused ports that can be closed, configurable security policies, and protections against unauthorized firmware or configuration changes.
• Monitoring and logging, for example what events are logged, where logs can be sent, supported formats, time synchronization expectations, and log retention constraints within the component.

This material is typically consumed by engineering, OT security, and IT security teams during design reviews and during security level allocation for zones and conduits.

3. Secure configuration and hardening guidance

Asset owners usually expect product-specific hardening guidance that can be incorporated into site standards and validated procedures, such as:

• Step-by-step instructions for enabling and verifying security-relevant settings (for example user management, disabling unused services, enabling encrypted protocols).
• Network placement recommendations that align with zone and conduit concepts, including any restrictions on direct internet connectivity, remote access models, and segmentation needs.
• Guidance on integrating with existing identity, logging, and backup systems where applicable, with clear statements when certain integrations are not supported.
• Default settings and their security implications, including what must be changed before use in production and what cannot be changed.
• Example configurations or reference architectures for common use cases in industrial networks, with notes on what is illustrative rather than prescriptive.

In regulated plants, this guidance is often used as an input to local hardening standards, standard work instructions, and validated configuration baselines.

4. Vulnerability, patch, and lifecycle information

Because component lifecycles in industrial environments are long, asset owners expect clarity about how security issues will be handled over time, including:

• A documented vulnerability disclosure and response process, including how asset owners can report issues and how advisories are published.
• Patch and update practices, for example release cadence, how security fixes are communicated, dependencies or prerequisites, and whether security fixes are ever withheld for unsupported versions.
• Supported versions and end-of-life timelines, including how long security support is expected and what happens after end-of-support.
• Any constraints on applying updates in running plants, for example reboot requirements, compatibility considerations, and test recommendations prior to production deployment.

Asset owners need this to plan their own validation, change control, and maintenance windows. Lack of clarity here is often a reason components are not accepted or are isolated with additional controls.

5. Evidence of secure development and testing (as applicable)

For components claiming alignment with IEC 62443 secure development and technical requirements, asset owners may request evidence that can be reviewed under non-disclosure where needed, such as:

• High-level description of the secure development lifecycle (SDL) used, mapped at least conceptually to IEC 62443-4-1 practices, without exposing proprietary details.
• Information on security testing approaches used during development, for example static analysis, fuzzing, penetration testing, and regression testing around security functions.
• Summaries of how third-party components and libraries are tracked and updated from a security standpoint.
• If available, references to third-party assessments or certifications, with clear scope and limitations, and without implying that these guarantee regulatory compliance.

In more heavily regulated or safety-critical environments, this material often feeds into supplier qualification, risk assessments, and design assurance activities.

6. Operational and incident-handling guidance

Asset owners also look for operational documentation that explains how to manage the component securely in a live plant:

• Procedures for secure commissioning and decommissioning, including secure disposal or sanitization of data and credentials.
• Backup and restore methods for configurations and data, with notes on what is and is not included in backups, and how integrity is verified.
• Guidance on detecting and responding to suspected compromise or misconfiguration, including log locations, key indicators, and safe recovery approaches.
• Dependencies on external services (for example NTP, DNS, certificate authorities) and the impact if they are degraded or compromised.

This material should be explicit about operational limits and failure modes so that plant procedures can realistically account for them.

7. Versioning, traceability, and change documentation

In regulated and audit-prone environments, asset owners rely heavily on version control and traceability. They typically expect:

• Clear version identifiers for firmware, software, and hardware revisions, and which documentation set applies to which versions.
• Change histories or release notes that highlight security-relevant changes, deprecated settings, and new risks introduced by updates.
• Checksums or other mechanisms that allow verification that downloaded firmware and software have not been altered.
• Stable document identifiers and revision histories so documents can be referenced in internal procedures, qualification records, and validation reports.

Without this, asset owners struggle to maintain traceability between approved configurations, deployed assets, and the vendor’s stated security properties.

8. Brownfield and coexistence considerations

Most asset owners operate brownfield plants with mixed vendors and legacy stacks. They expect documentation to address coexistence topics such as:

• Known interoperability constraints or incompatibilities with common industrial protocols or legacy systems.
• Minimum supported protocol versions and operating systems, where relevant, and any security risks if older versions are used.
• Impact of enabling security features on latency, throughput, or compatibility with existing MES, SCADA, or historian systems.
• Guidance for incremental deployment, for example running secure and legacy modes in parallel, and limitations of such transitional configurations.

Asset owners rarely perform wholesale replacement of existing systems because of validation burden, downtime risk, and integration complexity. Documentation that acknowledges and supports phased adoption is generally better received.

9. Constraints and variability across sites

The exact set of documents expected will vary by industry, regulator, and plant maturity. Some sites will request detailed evidence packages, others will focus on practical hardening guides and lifecycle information. Vendors should avoid implying that providing this documentation guarantees compliance or successful audits. Instead, documentation should be explicit about:

• Which security properties the component can realistically support, under which conditions.
• Where the asset owner is expected to provide compensating controls.
• What is not addressed by the component or its documentation, especially where IEC 62443 places responsibilities on the integrator or asset owner.

Asset owners will then integrate this material into their own risk assessments, validation activities, and operational procedures.