BranchesTags

Repository files navigation

GoPLC

Status

GoPLC

A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.

Motivation

Industrial automation is stuck in the past. Proprietary IDEs, vendor lock-in, no real version control, and languages that don't transfer to any other domain. If you're going to learn something new anyway, why not use a real programming language with modern tooling? GoPLC lets you write control logic in native Go using VS Code, Git, and CI/CD pipelines instead of being locked into Ladder Logic or Structured Text. It's time to bring software development practices from the last two decades into industrial automation.

Quick Start

Coming soon. Installation and usage instructions will be added as the project develops.

Usage

What is a Soft PLC?

A traditional PLC is a specialized industrial computer that runs control logic for manufacturing equipment. A soft PLC does the same thing but runs on standard hardware—the control software without the proprietary box.

Architecture Overview

GoPLC communicates with industrial devices via standard protocols and exposes data through multiple interfaces:

Input/Output:

  • Modbus TCP/RTU for sensors, actuators, and I/O modules
  • Automatic reconnection with exponential backoff

SCADA Integration:

  • OPC UA server for traditional industrial SCADA systems (Ignition, Kepware, etc.)
  • GraphQL API for modern web/mobile integrations
  • Optional Zenoh protocol for high-performance pub/sub (Phase 2)

Monitoring:

  • Built-in WebUI for real-time monitoring and control
  • System health, connection status, variable values, task execution

Variables are defined once in YAML and automatically exposed to all protocols. The runtime handles scheduling, scaling, and protocol translation.

Development Guidelines

Project Structure:

  • Registry pattern for extensible protocol support
  • Protocol implementations in internal/source/<protocol>/
  • Each protocol self-registers via init() functions

Error Management:

  • Use structured error format: [Component] - [Description] (context: value, ...)
    • Example: [config] - Unknown source type 'opcua' (source: plc1)
  • Each package contains an errors.go file with helper functions
  • Use panic() only for programmer errors; return error for runtime errors

Testing:

  • Unit tests use table-driven test pattern
  • Test coverage required for all error paths

Contributing

Contributions are welcome. If you find a bug or have a feature request, please open an issue. If you want to submit code, please open a pull request with a clear description of your changes.

License

O'Saasy License Agreement - MIT do-whatever-you-want license, but with the commercial rights for SaaS reserved for the copyright holder.

About

A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.

Resources

Readme
License
Activity

Stars

1 star

Watchers

0 watching

Forks

0 forks
Report repository

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
GoPLC
Status
GoPLC
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Motivation
Industrial automation is stuck in the past. Proprietary IDEs, vendor lock-in, no real version control, and languages that don't transfer to any other domain. If you're going to learn something new anyway, why not use a real programming language with modern tooling? GoPLC lets you write control logic in native Go using VS Code, Git, and CI/CD pipelines instead of being locked into Ladder Logic or Structured Text. It's time to bring software development practices from the last two decades into industrial automation.
Quick Start
Coming soon. Installation and usage instructions will be added as the project develops.
Usage
What is a Soft PLC?
A traditional PLC is a specialized industrial computer that runs control logic for manufacturing equipment. A soft PLC does the same thing but runs on standard hardware—the control software without the proprietary box.
Architecture Overview
GoPLC communicates with industrial devices via standard protocols and exposes data through multiple interfaces:
Input/Output:
  • Modbus TCP/RTU for sensors, actuators, and I/O modules
  • Automatic reconnection with exponential backoff
SCADA Integration:
  • OPC UA server for traditional industrial SCADA systems (Ignition, Kepware, etc.)
  • GraphQL API for modern web/mobile integrations
  • Optional Zenoh protocol for high-performance pub/sub (Phase 2)
Monitoring:
  • Built-in WebUI for real-time monitoring and control
  • System health, connection status, variable values, task execution
Variables are defined once in YAML and automatically exposed to all protocols. The runtime handles scheduling, scaling, and protocol translation.
Development Guidelines
Project Structure:
  • Registry pattern for extensible protocol support
  • Protocol implementations in internal/source/<protocol>/
  • Each protocol self-registers via init() functions
Error Management:
  • Use structured error format: [Component] - [Description] (context: value, ...)
    • Example: [config] - Unknown source type 'opcua' (source: plc1)
  • Each package contains an errors.go file with helper functions
  • Use panic() only for programmer errors; return error for runtime errors
Testing:
  • Unit tests use table-driven test pattern
  • Test coverage required for all error paths
Contributing
Contributions are welcome. If you find a bug or have a feature request, please open an issue. If you want to submit code, please open a pull request with a clear description of your changes.
License
O'Saasy License Agreement - MIT do-whatever-you-want license, but with the commercial rights for SaaS reserved for the copyright holder.
About
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Resources
Readme
License
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
GoPLC
Status
GoPLC
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Motivation
Industrial automation is stuck in the past. Proprietary IDEs, vendor lock-in, no real version control, and languages that don't transfer to any other domain. If you're going to learn something new anyway, why not use a real programming language with modern tooling? GoPLC lets you write control logic in native Go using VS Code, Git, and CI/CD pipelines instead of being locked into Ladder Logic or Structured Text. It's time to bring software development practices from the last two decades into industrial automation.
Quick Start
Coming soon. Installation and usage instructions will be added as the project develops.
Usage
What is a Soft PLC?
A traditional PLC is a specialized industrial computer that runs control logic for manufacturing equipment. A soft PLC does the same thing but runs on standard hardware—the control software without the proprietary box.
Architecture Overview
GoPLC communicates with industrial devices via standard protocols and exposes data through multiple interfaces:
Input/Output:
  • Modbus TCP/RTU for sensors, actuators, and I/O modules
  • Automatic reconnection with exponential backoff
SCADA Integration:
  • OPC UA server for traditional industrial SCADA systems (Ignition, Kepware, etc.)
  • GraphQL API for modern web/mobile integrations
  • Optional Zenoh protocol for high-performance pub/sub (Phase 2)
Monitoring:
  • Built-in WebUI for real-time monitoring and control
  • System health, connection status, variable values, task execution
Variables are defined once in YAML and automatically exposed to all protocols. The runtime handles scheduling, scaling, and protocol translation.
Development Guidelines
Project Structure:
  • Registry pattern for extensible protocol support
  • Protocol implementations in internal/source/<protocol>/
  • Each protocol self-registers via init() functions
Error Management:
  • Use structured error format: [Component] - [Description] (context: value, ...)
    • Example: [config] - Unknown source type 'opcua' (source: plc1)
  • Each package contains an errors.go file with helper functions
  • Use panic() only for programmer errors; return error for runtime errors
Testing:
  • Unit tests use table-driven test pattern
  • Test coverage required for all error paths
Contributing
Contributions are welcome. If you find a bug or have a feature request, please open an issue. If you want to submit code, please open a pull request with a clear description of your changes.
License
O'Saasy License Agreement - MIT do-whatever-you-want license, but with the commercial rights for SaaS reserved for the copyright holder.
About
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Resources
Readme
License
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
GoPLC
Status
GoPLC
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Motivation
Industrial automation is stuck in the past. Proprietary IDEs, vendor lock-in, no real version control, and languages that don't transfer to any other domain. If you're going to learn something new anyway, why not use a real programming language with modern tooling? GoPLC lets you write control logic in native Go using VS Code, Git, and CI/CD pipelines instead of being locked into Ladder Logic or Structured Text. It's time to bring software development practices from the last two decades into industrial automation.
Quick Start
Coming soon. Installation and usage instructions will be added as the project develops.
Usage
What is a Soft PLC?
A traditional PLC is a specialized industrial computer that runs control logic for manufacturing equipment. A soft PLC does the same thing but runs on standard hardware—the control software without the proprietary box.
Architecture Overview
GoPLC communicates with industrial devices via standard protocols and exposes data through multiple interfaces:
Input/Output:
  • Modbus TCP/RTU for sensors, actuators, and I/O modules
  • Automatic reconnection with exponential backoff
SCADA Integration:
  • OPC UA server for traditional industrial SCADA systems (Ignition, Kepware, etc.)
  • GraphQL API for modern web/mobile integrations
  • Optional Zenoh protocol for high-performance pub/sub (Phase 2)
Monitoring:
  • Built-in WebUI for real-time monitoring and control
  • System health, connection status, variable values, task execution
Variables are defined once in YAML and automatically exposed to all protocols. The runtime handles scheduling, scaling, and protocol translation.
Development Guidelines
Project Structure:
  • Registry pattern for extensible protocol support
  • Protocol implementations in internal/source/<protocol>/
  • Each protocol self-registers via init() functions
Error Management:
  • Use structured error format: [Component] - [Description] (context: value, ...)
    • Example: [config] - Unknown source type 'opcua' (source: plc1)
  • Each package contains an errors.go file with helper functions
  • Use panic() only for programmer errors; return error for runtime errors
Testing:
  • Unit tests use table-driven test pattern
  • Test coverage required for all error paths
Contributing
Contributions are welcome. If you find a bug or have a feature request, please open an issue. If you want to submit code, please open a pull request with a clear description of your changes.
License
O'Saasy License Agreement - MIT do-whatever-you-want license, but with the commercial rights for SaaS reserved for the copyright holder.
About
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Resources
Readme
License
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
GoPLC
Status
GoPLC
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Motivation
Industrial automation is stuck in the past. Proprietary IDEs, vendor lock-in, no real version control, and languages that don't transfer to any other domain. If you're going to learn something new anyway, why not use a real programming language with modern tooling? GoPLC lets you write control logic in native Go using VS Code, Git, and CI/CD pipelines instead of being locked into Ladder Logic or Structured Text. It's time to bring software development practices from the last two decades into industrial automation.
Quick Start
Coming soon. Installation and usage instructions will be added as the project develops.
Usage
What is a Soft PLC?
A traditional PLC is a specialized industrial computer that runs control logic for manufacturing equipment. A soft PLC does the same thing but runs on standard hardware—the control software without the proprietary box.
Architecture Overview
GoPLC communicates with industrial devices via standard protocols and exposes data through multiple interfaces:
Input/Output:
  • Modbus TCP/RTU for sensors, actuators, and I/O modules
  • Automatic reconnection with exponential backoff
SCADA Integration:
  • OPC UA server for traditional industrial SCADA systems (Ignition, Kepware, etc.)
  • GraphQL API for modern web/mobile integrations
  • Optional Zenoh protocol for high-performance pub/sub (Phase 2)
Monitoring:
  • Built-in WebUI for real-time monitoring and control
  • System health, connection status, variable values, task execution
Variables are defined once in YAML and automatically exposed to all protocols. The runtime handles scheduling, scaling, and protocol translation.
Development Guidelines
Project Structure:
  • Registry pattern for extensible protocol support
  • Protocol implementations in internal/source/<protocol>/
  • Each protocol self-registers via init() functions
Error Management:
  • Use structured error format: [Component] - [Description] (context: value, ...)
    • Example: [config] - Unknown source type 'opcua' (source: plc1)
  • Each package contains an errors.go file with helper functions
  • Use panic() only for programmer errors; return error for runtime errors
Testing:
  • Unit tests use table-driven test pattern
  • Test coverage required for all error paths
Contributing
Contributions are welcome. If you find a bug or have a feature request, please open an issue. If you want to submit code, please open a pull request with a clear description of your changes.
License
O'Saasy License Agreement - MIT do-whatever-you-want license, but with the commercial rights for SaaS reserved for the copyright holder.
About
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Resources
Readme
License
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
GoPLC
Status
GoPLC
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Motivation
Industrial automation is stuck in the past. Proprietary IDEs, vendor lock-in, no real version control, and languages that don't transfer to any other domain. If you're going to learn something new anyway, why not use a real programming language with modern tooling? GoPLC lets you write control logic in native Go using VS Code, Git, and CI/CD pipelines instead of being locked into Ladder Logic or Structured Text. It's time to bring software development practices from the last two decades into industrial automation.
Quick Start
Coming soon. Installation and usage instructions will be added as the project develops.
Usage
What is a Soft PLC?
A traditional PLC is a specialized industrial computer that runs control logic for manufacturing equipment. A soft PLC does the same thing but runs on standard hardware—the control software without the proprietary box.
Architecture Overview
GoPLC communicates with industrial devices via standard protocols and exposes data through multiple interfaces:
Input/Output:
  • Modbus TCP/RTU for sensors, actuators, and I/O modules
  • Automatic reconnection with exponential backoff
SCADA Integration:
  • OPC UA server for traditional industrial SCADA systems (Ignition, Kepware, etc.)
  • GraphQL API for modern web/mobile integrations
  • Optional Zenoh protocol for high-performance pub/sub (Phase 2)
Monitoring:
  • Built-in WebUI for real-time monitoring and control
  • System health, connection status, variable values, task execution
Variables are defined once in YAML and automatically exposed to all protocols. The runtime handles scheduling, scaling, and protocol translation.
Development Guidelines
Project Structure:
  • Registry pattern for extensible protocol support
  • Protocol implementations in internal/source/<protocol>/
  • Each protocol self-registers via init() functions
Error Management:
  • Use structured error format: [Component] - [Description] (context: value, ...)
    • Example: [config] - Unknown source type 'opcua' (source: plc1)
  • Each package contains an errors.go file with helper functions
  • Use panic() only for programmer errors; return error for runtime errors
Testing:
  • Unit tests use table-driven test pattern
  • Test coverage required for all error paths
Contributing
Contributions are welcome. If you find a bug or have a feature request, please open an issue. If you want to submit code, please open a pull request with a clear description of your changes.
License
O'Saasy License Agreement - MIT do-whatever-you-want license, but with the commercial rights for SaaS reserved for the copyright holder.
About
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Resources
Readme
License
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
GoPLC
Status
GoPLC
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Motivation
Industrial automation is stuck in the past. Proprietary IDEs, vendor lock-in, no real version control, and languages that don't transfer to any other domain. If you're going to learn something new anyway, why not use a real programming language with modern tooling? GoPLC lets you write control logic in native Go using VS Code, Git, and CI/CD pipelines instead of being locked into Ladder Logic or Structured Text. It's time to bring software development practices from the last two decades into industrial automation.
Quick Start
Coming soon. Installation and usage instructions will be added as the project develops.
Usage
What is a Soft PLC?
A traditional PLC is a specialized industrial computer that runs control logic for manufacturing equipment. A soft PLC does the same thing but runs on standard hardware—the control software without the proprietary box.
Architecture Overview
GoPLC communicates with industrial devices via standard protocols and exposes data through multiple interfaces:
Input/Output:
  • Modbus TCP/RTU for sensors, actuators, and I/O modules
  • Automatic reconnection with exponential backoff
SCADA Integration:
  • OPC UA server for traditional industrial SCADA systems (Ignition, Kepware, etc.)
  • GraphQL API for modern web/mobile integrations
  • Optional Zenoh protocol for high-performance pub/sub (Phase 2)
Monitoring:
  • Built-in WebUI for real-time monitoring and control
  • System health, connection status, variable values, task execution
Variables are defined once in YAML and automatically exposed to all protocols. The runtime handles scheduling, scaling, and protocol translation.
Development Guidelines
Project Structure:
  • Registry pattern for extensible protocol support
  • Protocol implementations in internal/source/<protocol>/
  • Each protocol self-registers via init() functions
Error Management:
  • Use structured error format: [Component] - [Description] (context: value, ...)
    • Example: [config] - Unknown source type 'opcua' (source: plc1)
  • Each package contains an errors.go file with helper functions
  • Use panic() only for programmer errors; return error for runtime errors
Testing:
  • Unit tests use table-driven test pattern
  • Test coverage required for all error paths
Contributing
Contributions are welcome. If you find a bug or have a feature request, please open an issue. If you want to submit code, please open a pull request with a clear description of your changes.
License
O'Saasy License Agreement - MIT do-whatever-you-want license, but with the commercial rights for SaaS reserved for the copyright holder.
About
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Resources
Readme
License
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
Repository files navigation
GoPLC
Status
GoPLC
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Motivation
Industrial automation is stuck in the past. Proprietary IDEs, vendor lock-in, no real version control, and languages that don't transfer to any other domain. If you're going to learn something new anyway, why not use a real programming language with modern tooling? GoPLC lets you write control logic in native Go using VS Code, Git, and CI/CD pipelines instead of being locked into Ladder Logic or Structured Text. It's time to bring software development practices from the last two decades into industrial automation.
Quick Start
Coming soon. Installation and usage instructions will be added as the project develops.
Usage
What is a Soft PLC?
A traditional PLC is a specialized industrial computer that runs control logic for manufacturing equipment. A soft PLC does the same thing but runs on standard hardware—the control software without the proprietary box.
Architecture Overview
GoPLC communicates with industrial devices via standard protocols and exposes data through multiple interfaces:
Input/Output:
  • Modbus TCP/RTU for sensors, actuators, and I/O modules
  • Automatic reconnection with exponential backoff
SCADA Integration:
  • OPC UA server for traditional industrial SCADA systems (Ignition, Kepware, etc.)
  • GraphQL API for modern web/mobile integrations
  • Optional Zenoh protocol for high-performance pub/sub (Phase 2)
Monitoring:
  • Built-in WebUI for real-time monitoring and control
  • System health, connection status, variable values, task execution
Variables are defined once in YAML and automatically exposed to all protocols. The runtime handles scheduling, scaling, and protocol translation.
Development Guidelines
Project Structure:
  • Registry pattern for extensible protocol support
  • Protocol implementations in internal/source/<protocol>/
  • Each protocol self-registers via init() functions
Error Management:
  • Use structured error format: [Component] - [Description] (context: value, ...)
    • Example: [config] - Unknown source type 'opcua' (source: plc1)
  • Each package contains an errors.go file with helper functions
  • Use panic() only for programmer errors; return error for runtime errors
Testing:
  • Unit tests use table-driven test pattern
  • Test coverage required for all error paths
Contributing
Contributions are welcome. If you find a bug or have a feature request, please open an issue. If you want to submit code, please open a pull request with a clear description of your changes.
License
O'Saasy License Agreement - MIT do-whatever-you-want license, but with the commercial rights for SaaS reserved for the copyright holder.
About
A soft PLC written in Go that replaces proprietary industrial programming languages with modern development tools.
Resources
Readme
License
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages