In 2026, AUTONDMY’s OPENPLC V4 underwent a major update, with both the Editor and Runtime officially releasing V4! This series will conduct various tests using OPENPLC V4 in practice. We’ll start by explaining everything from basic operations to debugging.

Additionally, the Open PLC Runtime will be installed in a Docker container on Advantech’s AMAX-7580 100D5A.

Let’s enjoy FA!

Foreword

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We are currently running the “Takahashi Chris” radio show with Full-san (full＠桜八重 (@fulhause) / X) which I deliver every Wednesday night.

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OPENPLC V4

Starting in January 2026, OpenPLC will undergo a complete overhaul, featuring a modern interface, cloud orchestration, and powerful capabilities for programming PLCs from anywhere.

Compared to OPENPLCv3, it leans much more toward a full-fledged industrial PLC, featuring a design that emphasizes Autonomy Edge (cloud management) and security.

Autonomy Edge — Cloud-based management and deployment of vPLCs
Virtual PLCs — Run anywhere from embedded systems to cloud servers
IEC 61131-3 — Fully supports LD, ST, FBD, IL, SFC
Multi-Platform — Windows, macOS, Linux, Raspberry Pi, Arduino
Secure by Design — Industrial-grade security
Real-time Performance — Deterministic real-time control
Open Source — Free and freely usable
Modular Architecture — Extendable with plugins and custom FBs

OpenPLC Runtime v4 has significantly evolved beyond v3, becoming a headless industrial programmable logic controller (PLC) runtime that transforms standard computing hardware into a powerful automation controller.

Execute IEC 61131-3 programs created in OpenPLC Editor. In addition to IEC 61131-3 languages (Ladder Logic, Structured Text, Function Block Diagram, etc.), it also supports Python, C, and C++.

Modern Architecture

An architecture completely redesigned from the ground up to meet the demands of modern industrial automation.

Real-time Execution
SCHED_FIFO priority scheduling enables deterministic scan cycles for reliable control.。
WebSocket Debug
The highly secure WebSocket debugging interface enables real-time variable monitoring and forced writing.
Plugin System
An extensible plugin system supporting Python and C/C++ plugins for hardware I/O and ICS protocols.
Multi-architecture
OpenPLC Runtime can be executed on any Linux-compatible environment. Fully multi-architecture compatible.
Security Built-in
All communications employ TLS encryption, with JWT (JSON Web Token)-based authentication built into the foundation.

Implementation

Now let’s actually start creating the program.

Runtime Installation

Execute this command to pull the Openplc Docker image.

docker pull ghcr.io/autonomy-logic/openplc-runtime:latest

Please wait a moment…

Done!

Trouble

Here are the troubleshooting steps I used when setting it up.

ping 8.8.8.8 が Destination Net Unreachable

First, traffic is reaching 192.168.0.100. This means it’s passing through the wireless access point.However, since your default gateway is 192.168.0.100, to go outside, you need “192.168.0.100 to forward it as a router.”

oem@ubuntu:~$ ping -c 3 192.168.0.100 PING 192.168.0.100 (192.168.0.100) 56(84) bytes of data. 64 bytes from 192.168.0.100: icmp_seq=1 ttl=64 time=0.374 ms

My IPC also has enp5s0: 192.168.0.200/24. And since there’s a “router to the real internet” on the 192.168.5.0/24 side, I’ll set that as the default.

sudo ip route replace default via 192.168.5.1 dev enp5s0
ping -c 3 8.8.8.8

docker ps Cannot connect to the Docker daemon

This is when there is an error when you cannot connect to Docker.

oem@ubuntu:~$ docker ps Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Check the status of Docker.

oem@ubuntu:~$ systemctl status docker –no-pager ● docker.service – Docker Application Container Engine Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled) Active: active (running) since Sun 2026-02-08 20:20:27 UTC; 5s ago TriggeredBy: ● docker.socket

Start Docker and enable it.

sudo systemctl start docker
sudo systemctl enable docker

sudo docker run hello-world Unable to find imag

This is less a Docker issue and more a result of DNS (name resolution) being broken.

oem@ubuntu:~$ sudo docker run hello-world Unable to find image ‘hello-world:latest’ locally docker: Error response from daemon: Get “https://registry-1.docker.io/v2/”: dial tcp: lookup registry-1.docker.io on 127.0.0.53:53: server misbehaving

lookup registry-1.docker.io on 127.0.0.53:53: server misbehaving

Let’s just fix the DNS.

sudo resolvectl dns enp4s0 1.1.1.1 8.8.8.8
sudo resolvectl domain enp4s0 “~.”
sudo resolvectl default-route enp4s0 yes
sudo resolvectl flush-caches

sudo docker run hello-world

oem@ubuntu:~$ sudo docker run hello-world Unable to find image ‘hello-world:latest’ locally latest: Pulling from library/hello-world 17eec7bbc9d7: Pull complete Digest: sha256:05813aedc15fb7b4d732e1be879d3252c1c9c25d885824f6295cab4538cb85cd Status: Downloaded newer image for hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly.

Runtime launch

Next, start the container using the following command.

docker run -d \
–name openplc-runtime \
-p 8443:8443 \
–cap-add=SYS_NICE \
–cap-add=SYS_RESOURCE \
-v openplc-runtime-data:/var/run/runtime \
ghcr.io/autonomy-logic/openplc-runtime:latest

Done!