How did PLC come into being? The indissoluble bond between PLC and automobile production lines

PLC History: From Automobile Lines to Industry 4.0

2026 Industrial Intelligence Report

The PLC was invented for car factories. Understanding this history clarifies why PLCs control the way they do—and where they're going.

PLC Evolution Timeline

1968
Modicon 084—first commercial PLC, built for GM Hydra-Matic. Relay replacement only.
1970s
Microprocessor PLCs. Memory expanded. Ladder logic standardized. Allen-Bradley enters.
1980s
Networking, distributed I/O. IEC 61131 started. First safety PLCs.
1990s
IEC 61131 finalized. Windows programming. Fieldbus protocols emerge.
2000s
Industrial Ethernet. Ethernet/IP, Profinet. Unified engineering environments.
2010s
Edge computing. Built-in safety. OPC UA. Cloud connectivity.
2020s
Edge analytics. AI integration. TSN networking. IT/OT convergence.
2026
Edge intelligence, predictive maintenance, full digital twins

But here's what matters: the core value hasn't changed—we read inputs, execute logic, write outputs. Everything around that core has evolved.

Auto Industry Milestones

1968

Modicon 084 for GM—first PLC

1971

Allen-Bradley enters market

1981

IEC 61131 work begins

1993

IEC 61131-3 standardized

2005

Ethernet dominates networking

2026

Edge intelligence

We've installed PLCs from the 1980s still running. S5, S7-200, ControlLogix—they're still going. The platform changes but the value remains.

— Field Service Engineer, 20+ years

What Changed (and What Hasn't)

Aspect 1968 2026 What's Same
Scan cycle Relay-based Deterministic Scan cycle
Programming Panel wiring Cloud programming Ladder still used
I/O Fixed Distributed Digital/analog
Communication Wired I/O Ethernet, WiFi I/O scan
Pro-Tip: The auto industry still drives PLC innovation. But the biggest change in 2026 is edge analytics. The next decade is about data.

The biggest value now isn't in faster scanning—it's in data. More data beats more processing speed.

FAQ

+Are old PLCs still viable?
Yes, many are still running. If it works and meets requirements—no reason to replace. We've seen 1980s PLCs still running reliably.
+What's driving future development?
Data—more data, edge analytics, predictive maintenance. The value is in information, not just control.
+Will PLCs disappear?
No. Deterministic control will always need PLCs. The platform evolves—replaced? Never.

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