Published:
- Machinery vs Software Documentation Standards
- IEC/IEEE 82079-1 vs ISO/IEC/IEEE 26514: User Manual Compliance
- Technical Writing for Manufacturing
- Functional Safety, Risk, and Industrial Automation Documentation
- How to Pass a Machinery Documentation Audit
- Machinery Documentation Standards and Software Information Architecture
When a compliance officer or documentation manager working with industrial automation documentation faces an audit, the question is rarely "did we follow a standard?" — it is "which standard actually applies, and how do we pass the audit successfully?". The answer is not as simple as pointing to a single document. Two standards sit at the center of this problem, and confusing them is one of the most common sources of audit findings in machinery documentation.
Machinery Documentation Standards vs Software Documentation Requirements
IEC/IEEE 82079-1:2019 is the horizontal standard for preparation of information for use (instructions for use) of products. It covers products of all kinds, "ranging from a tin of paint to large or highly complex products, such as large industrial machinery, turnkey based plants or buildings". This is the baseline for machinery documentation standards in the EU and US, and the reference point for technical writing for manufacturing across both markets.
ISO/IEC/IEEE 26514:2022 is the vertical standard for design and development of information for users of software, and one of the core software user documentation standards. It is explicitly a supplement to 82079-1, and it normatively refers only to the 82079 standard. The scope is software, not hardware.
This distinction matters because industrial automation products contain both: a physical machine and a software interface that controls it. One standard governs the machine. The other governs the interface — and with it, the software information architecture for industrial automation.
IEC/IEEE 82079-1 vs ISO/IEC/IEEE 26514: User Manual Compliance
| Parameter | IEC/IEEE 82079-1:2019 | ISO/IEC/IEEE 26514:2022 |
|---|---|---|
| Who it is for | Manufacturers of all technical products | Information architects and developers of software documentation |
| What it covers | All types of instructions for use | Information for users of software |
| Scope | Horizontal: all products, from simple to complex systems | Vertical: software documentation specifically |
| Relationship | Baseline standard | Supplement to 82079-1 |
| Process coverage | Complete information management lifecycle | Design and development throughout software lifecycle |
| Regulatory trigger | EU Machinery Regulation 2023/1230, product liability directives | Software validation, usability engineering requirements |
The most consequential difference is regulatory. IEC/IEEE 82079-1 is the standard referenced by EU Machinery Regulation 2023/1230, which mandates that instructions for use be provided in a language easily understood by users and be "clear, comprehensible and legible". This is not optional. It is a legal requirement for placing machinery on the EU market — the foundation of user manual compliance industrial machinery. ISO/IEC/IEEE 26514 has no equivalent regulatory mandate. It is a process standard, not a compliance trigger.
Technical Writing for Manufacturing: Two Failure Modes
To see how these standards diverge in practice, consider two failure modes that occur in industrial automation documentation.
Failure mode 1: The ambiguous safety instruction. A manual for a CNC machining center contains the instruction: "Before operation, verify that the spindle is in a safe condition." An auditor reviewing against IEC/IEEE 82079-1 finds a defect of completeness. The standard requires information for use to be verifiable — meaning the user must be able to determine objectively whether a condition is met. "Safe condition" has no measurable criteria. The corrected version might read: "Verify that the spindle speed indicator reads 0 RPM and that the emergency stop button is not engaged." This is a hardware safety issue, governed by 82079-1.
Failure mode 2: The orphaned interface element. A software control panel for a conveyor system includes a parameter labeled "Speed (m/min)" with no documented valid range. An engineer entering 500 m/min — far beyond the mechanical limit — causes a belt failure. Reviewing against ISO/IEC/IEEE 26514 reveals a defect of design: the standard requires that information for users of software be integrated with the user interface and that valid ranges be specified. This is a software documentation issue, governed by 26514.
The distinction is not academic. In the first case, the failure is in the machine documentation. In the second, it is in the software documentation. A single product may require both standards, applied to different parts of the information set — a daily reality for technical writing for manufacturing.
Functional Safety, Risk, and Industrial Automation Documentation
While IEC/IEEE 82079-1 and ISO/IEC/IEEE 26514 govern the information products themselves, industrial automation documentation rarely exists in a vacuum. In safety-critical applications, technical writers must align instructions with broader functional safety frameworks such as IEC 61508 (general functional safety of electrical/electronic/programmable electronic safety-related systems) or ISO 13849 (safety of machinery related to control systems).
Furthermore, when software safety and risk management are concerned, standards like IEC 62304 (software life cycle processes for medical devices, often looked to as a benchmark for rigorous software risk management) remind us that user documentation and safety-related software anomalies are tightly coupled. Integrating these hazard-analysis principles into documentation workflows ensures that warnings, residual risks, and software limitations are communicated accurately and legally defensible.
How to Pass a Machinery Documentation Audit
1. Map your documentation to the correct standard. Instructions for installing, operating, maintaining, and servicing the physical machine fall under IEC/IEEE 82079-1. Instructions for using the software interface — configuration screens, parameter settings, diagnostic tools — fall under ISO/IEC/IEEE 26514. Do not attempt to apply one standard to both domains.
2. Use 82079-1 as the compliance baseline for EU market access. EU Machinery Regulation 2023/1230 requires that instructions for use be provided in the official language(s) of the member state where the machinery is placed on the market, and that digital instructions be accessible online for at least ten years after market introduction. These are legal requirements, not best practices.
3. Use 26514 to close the software documentation gap. 82079-1 covers products generally, but it does not address the specific challenges of software user documentation standards: modular information architecture, topic-oriented content, information typing (concept, task, reference), and integration of help into the user interface. These are where 26514 adds value.
4. Prepare for the 26513 revision. ISO/IEC/IEEE 26513:2017, which covers testing and reviewing of information for users, is currently under revision. The Draft International Standard (DIS) was registered in 2025 and is in the enquiry phase as of early 2026. If your documentation process relies on the 2017 edition for review criteria, begin monitoring the revision now.
Machinery Documentation Standards and Software Information Architecture
IEC/IEEE 82079-1 and ISO/IEC/IEEE 26514 are not competing machinery documentation standards. One governs the machine. The other governs the software. For industrial automation products, both apply — but to different parts of the documentation set.
Get the mapping wrong and the consequences are concrete. Under EU Machinery Regulation 2023/1230, an instruction that fails the verifiability requirement of 82079-1 is a defect in the machine documentation and a barrier to market access. A software parameter left undocumented under 26514 is a defect in the software information architecture for industrial automation — one that surfaces as an operational failure, not a paperwork gap.
For compliance officers and documentation managers, the practical takeaway is threefold. First, classify every piece of content as machine-facing or software-facing before assigning a standard. Second, treat 82079-1 as the legal baseline for EU market access and 26514 as the process standard that closes the software documentation gap. Third, monitor the 26513 revision, since review criteria for user manual compliance industrial machinery and software documentation alike are about to change.
Confusing the two standards is not just a technical error. In the EU, it is a compliance risk. In the field, it is a safety risk. In an audit, it is the finding that writes itself.