Industrial Security / OT in Machines and Plants – Why It’s Becoming Mandatory Now
Machines and production systems are increasingly connected: remote service, VPN access, industrial PCs, edge gateways, OPC UA, MES/ERP links, robots, AGVs. This improves productivity — but it also creates new attack paths.
In OT, a security incident is rarely “just IT”. It can cause downtime, scrap, damaged equipment, or unsafe situations. That is why Industrial Security (OT security) is moving from “nice to have” to a practical requirement — legally, commercially, and in acceptance testing.
1) Why OT Security Matters for Operators
OT is not IT
In IT, the main concern is often data. In OT, the first priorities are availability and safe function: drives, presses, hydraulics, robots, guarding, and control systems. That changes how you treat updates, access, and network design. A “small” weakness can have large real-world consequences.
Attacks target downtime and leverage
Common objectives in industrial environments are:
- production stoppage (extortion through downtime),
- manipulation (parameters, recipes, limits),
- entry through remote access or service providers.
The key question is not “if” incidents happen — it is: how quickly can you contain them and restore safe operation?
Security directly affects safety
If safety-relevant control functions, parameters, or data can be influenced digitally, security becomes a safety topic. This does not replace functional safety — but it means that tampering and malicious interference must be considered as part of risk and design.
2) What Is Changing Legally (and Why It Hits OT)
Timeline in 30 seconds (EU)
- EU Machinery Regulation (EU) 2023/1230: applies from 20 Jan 2027
- NIS2 Directive (EU) 2022/2555: applies from 18 Oct 2024 (via national implementation)
- Cyber Resilience Act (EU) 2024/2847: published 20 Nov 2024; first obligations from 11 Sep 2026; fully applicable from 11 Dec 2027
In practice, this means OT security becomes:
- an acceptance / conformity topic,
- a supply chain topic (products + components + software),
- a management topic (processes, responsibilities, reporting).
A) Machinery Regulation: “Protection against tampering/corruption” becomes testable
The Machinery Regulation introduces a clear expectation: safety-relevant control functions must be protected against unintentional and intentional manipulation, including through connectivity and remote access.
What this means in practice:
- remote access and connected devices must not create a hazardous situation,
- safety-relevant software/parameters/data must be identified and protected,
- changes must be detectable and traceable (change control + logging),
- “malicious third-party attempts” become part of risk thinking (risk-based).
For operators, this shows up quickly in acceptance discussions — even before 2027 — because customers, insurers, and auditors increasingly expect “state of the art” measures.
B) NIS2: cybersecurity becomes a management duty (and includes reporting)
NIS2 pushes organizations toward structured risk management: responsibilities, measures, and reporting channels for significant incidents. This only works if OT is visible: assets, access paths, logs, and decision processes must exist.
C) Cyber Resilience Act (CRA): pressure through products and procurement
CRA targets “products with digital elements.” For operators this means: security evidence will become part of RFQs, contracts, and handovers — not only an internal IT discussion.
Typical consequences:
- more questions about security update capability and patch handling,
- more documentation: software bill of materials (SBOM), security advisories, vulnerability handling,
- clearer commitments: support periods, update delivery, and how vulnerabilities are communicated.
D) National requirements (example: Germany / KRITIS / BSI)
If an operator falls under national critical infrastructure rules or similar regimes, additional proof obligations may apply (minimum standards, audits, reporting channels). Even if not, market expectations are moving in that direction.
3) What Operators Need in Practice (Minimum + Proof)
Where OT security typically fails
In real projects the same weaknesses appear again and again:
- remote access grew historically (no MFA, no approval process, no logging),
- flat networks (office IT and machines too close),
- old systems that cannot be patched — without compensating controls,
- shared accounts, unclear roles, weak credential handling,
- backups exist, but restore is not tested (so recovery is wishful thinking).
Segmentation: start small, be consistent
If you only do one thing properly: separate zones. A simple reference model is Purdue: office IT on top, production OT below, with a DMZ for controlled data exchange.
A realistic minimum setup:
- IT/OT separation (avoid flat networks),
- a DMZ for defined transitions (reporting, historian, jump host),
- OT cells as zones, with controlled conduits (ports/protocols documented),
- remote access only via defined routes (time-limited, MFA, logged).
The minimum an operator should have today
- OT asset inventory (devices, versions, owners, access paths)
- zone/conduit overview (one page is enough — if it is correct)
- remote access concept (MFA, approval, logging, ability to disable quickly)
- backup + restore (including a restore test)
- patch/vulnerability process (including compensating controls if not patchable)
- roles and rights (least privilege; no shared admin accounts)
- incident plan (who decides, who acts, how to recover safely)
- supplier governance (security requirements in quotes/contracts)
What auditors and acceptance teams usually want as evidence
- zone/conduit diagram + rule set (which connections are allowed and why),
- remote access list + approval roles + logging approach,
- backup/restore proof (when tested; what can be restored),
- patch/vulnerability decision process (how risks are assessed),
- incident response plan (contacts, steps, recovery logic).
4) IEC 62443 as a Practical Framework
IEC 62443 is the most established structure for OT security. You do not need to memorize every clause — but you should understand the logic:
- Zones and conduits (segmentation and controlled communication),
- Security Levels (SL) as target protection levels per zone,
- Foundational Requirements (FR1–FR7) as a structured checklist,
- operator and service-provider processes (Part 2),
- system risk and requirements (Part 3),
- component requirements and secure development (Part 4).
For procurement and projects, the big advantage is simple: IEC 62443 gives you a common language for requirements, evidence, and responsibilities.
5) A Realistic 30-Day Start Plan
If you want progress without turning this into a bureaucracy project:
- Week 1: build an OT asset list + document all access paths (including “unofficial” ones)
- Week 2: define IT/OT separation + DMZ + document allowed data flows
- Week 3: fix remote access (MFA, approval, logging) + test restore
- Week 4: write an incident plan + add supplier requirements (updates, SBOM/advisories, support period)
6) Why This Gets More Important Every Year
Connectivity, regulation, and attacks are moving at the same time. The organizations that do the basics well — segmentation, remote access discipline, tested recovery, and clear processes — reduce downtime risk and become acceptance- and supply-chain-ready.
7) What We Can Do
Sources
Your original article (DE)
https://pohlann.de/industrial-security-ot-in-maschinen-und-anlagen-warum-es-jetzt-zur-pflicht-wird/
Pilz: IEC 62443 overview (DE)
https://www.pilz.com/de-DE/support/law-standards-norms/industrial-security-standards-iec-62443
Pilz: Industrial Security overview
https://www.pilz.com/de-DE/produkte/industrial-security
EU Machinery Regulation (EU) 2023/1230 (EUR-Lex, EN)
https://eur-lex.europa.eu/eli/reg/2023/1230/oj
NIS2 Directive (EU) 2022/2555 (EUR-Lex, EN)
https://eur-lex.europa.eu/eli/dir/2022/2555/oj
Cyber Resilience Act (EU) 2024/2847 (EUR-Lex, EN)
https://eur-lex.europa.eu/eli/reg/2024/2847/oj/eng
DIN Media: DIN EN IEC 62443-2-1
https://www.dinmedia.de/de/norm/din-en-iec-62443-2-1/391454082
DIN Media: DIN EN IEC 62443-2-4
https://www.dinmedia.de/de/norm/din-en-iec-62443-2-4/380674327
DKE overview: IEC 62443
https://www.dke.de/iec-62443
BSI: Industrial control systems (ICS) resources
https://www.bsi.bund.de/EN/Themen/Unternehmen-und-Organisationen/Informationen-und-Empfehlungen/Empfehlungen-nach-Angriffszielen/Industrielle-Steuerungs-und-Automatisierungssysteme/Tools/tools.html