Industry News · PLC Technology · 2026 Outlook
By KOEED Editorial Team · 2026-06-30 · 7 min read · Industry News
Programmable logic controllers have moved well beyond the scan-and-latch relays of a decade ago. Heading into 2026, the PLC is a networked, AI-capable, cyber-hardened edge node. These are the eight PLC development trends every maintenance engineer, integrator, and procurement lead should be tracking this year.
AI Summary — Key Takeaways
- Edge AI and TinyML now run inference directly on modern PLCs and edge controllers.
- OPC UA over TSN and OPC UA FX are becoming the vendor-neutral, deterministic backbone.
- IEC 62443 and the EU Cyber Resilience Act turn security into a compliance requirement.
- Virtual / software PLCs decouple control logic from proprietary hardware.
- Energy monitoring and digital twins are now standard controller features.
In 2026 the PLC is an AI-ready, TSN-connected, IEC 62443-hardened edge node — not just a logic solver.
What changed since 2024
The 2024 edition of this article framed IIoT, remote access, and cybersecurity as emerging themes. Two years on, they are baseline expectations. The real movement has been the arrival of on-device AI inference, the convergence of fieldbuses onto OPC UA over TSN, and the shift of cybersecurity from best practice to legal obligation under IEC 62443-4-1 and the EU Cyber Resilience Act.
| Dimension |
2024 baseline |
2026 direction |
| AI |
Cloud analytics |
Edge / on-device inference |
| Networking |
Ethernet/IP, PROFINET |
OPC UA over TSN, OPC UA FX |
| Security |
Recommended practice |
IEC 62443 + CRA mandate |
| Runtime |
Proprietary hardware |
Virtual / containerized PLC |
The eight trends shaping PLCs in 2026
1. Edge AI and on-device inference
TinyML models now run directly on the controller, so anomaly detection and predictive maintenance no longer wait on a round-trip to the cloud. Vendors ship AI-enabled edge modules alongside classic CPUs. KOEED's AI Diagnostic Tool reflects the same shift toward on-device intelligence.
2. OPC UA over TSN as the deterministic backbone
Time-Sensitive Networking brings deterministic, real-time behaviour to standard Ethernet, and OPC UA FX (Field eXchange) extends OPC UA down to controller-to-controller and controller-to-device links. The result is a vendor-neutral fabric that finally lets multi-brand lines talk without a rack of gateways.
3. Virtual and software-defined PLCs
Control logic is decoupling from proprietary silicon. Siemens SIMATIC S7-1500V and CODESYS Virtual Control run IEC 61131-3 programs in containers on industrial PCs and edge servers, easing scaling and disaster recovery — while installed Siemens SIMATIC hardware keeps running the plant floor.
4. Cybersecurity as compliance: IEC 62443 and the CRA
Security is now a documented obligation. IEC 62443-4-1/4-2 secure-development and component requirements, plus the EU Cyber Resilience Act, mean new controllers ship with signed firmware, role-based access, and audit logging by default. Reading and clearing faults early matters — the PLC Error Code Database helps triage.
! Warning
Legacy PLCs (SLC 500, S7-300, MELSEC-A) predate IEC 62443. Segment them behind firewalls or plan migration before connecting them to IT networks.
5. Higher processing power and hybrid PLC/PC controllers
Multi-core CPUs and larger memory let a single controller handle motion, vision, and analytics that once needed separate boxes. Hybrid PLC/PC platforms blur the line between deterministic control and general compute.
6. Low-code engineering and IEC 61131-3 / 61499
Modern toolchains add drag-and-drop configuration, reusable AOIs, and IEC 61499 event-driven function blocks for distributed control. Commissioning gets faster, and portability across vendors improves.
7. Private 5G, MQTT Sparkplug and cloud-to-edge data
Private 5G and MQTT Sparkplug B give lean, report-by-exception telemetry from the controller to dashboards without flooding the network. On brownfield lines, gateways bridge Allen-Bradley ControlLogix and other legacy CPUs into the same data model.
8. Energy efficiency, sustainability and digital twins
Built-in energy metering, power-saving modes, and live digital twins let teams simulate changes and cut consumption before touching the real line. Sustainability reporting is increasingly wired straight into the controller.
Note
Modernising a line often means running new and legacy modules side by side. KOEED stocks both — email Moritta@KOEED.COM with your BOM.
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Frequently asked questions
What is OPC UA over TSN?
It combines the vendor-neutral OPC UA data model with Time-Sensitive Networking, giving deterministic, real-time communication over standard industrial Ethernet.
Does IEC 62443 apply to my existing PLCs?
Legacy CPUs rarely meet IEC 62443 on their own. Segment them behind firewalls and plan migration before exposing them to connected IT networks.
What is a virtual or software PLC?
A virtual PLC runs IEC 61131-3 control logic as software in a container on an industrial PC or edge server instead of on dedicated controller hardware.
Can KOEED supply both legacy and current PLC modules?
Yes. KOEED keeps active and EOL stock side by side across nine brands. Send your BOM to Moritta@KOEED.COM for a quote within 24 hours.
KOEED Editorial Team
Industrial automation editors at KOEED. We write about PLC sourcing, cross-reference, and legacy system support. Reach the team at Moritta@KOEED.COM.
