IEC 61131-3 for Visual Studio Code
IEC 61131-3 language support for Visual Studio Code — syntax highlighting and language
configuration for IEC 61131-3 source files.
Features
- Syntax Highlighting — supports
.iec, .st, .iecst files
- Control flow keywords (
if/end_if, for/end_for, case/end_case, etc.)
- POU declarations (
function, function_block, program, method, class, etc.)
- Variable section keywords (
var, var_input, var_output, var_in_out, etc.)
- Data types (
bool, byte, char, date_and_time, dint, dt, int, ldate_and_time, ldt, lint, lreal, string, time, wchar, wstring, etc.)
- Duration literals (e.g.
t#1h30m, time#500ms)
- Date/time literals (e.g.
d#2024-01-01, tod#12:00:00)
- Numeric literals (decimal, hex
16#, binary 2#, octal 8#)
- Direct addresses (e.g.
%ix0.0, %qw1, %md2)
- Operators (
:=, ?=, &, or, not, mod, xor, etc.)
- Line comments (
//) and block comments ((*..*), /*..*/)
- Pragmas (
{...})
- Single-quoted and double-quoted strings with
$-escape sequences
- Language Configuration
- Bracket matching for
() and []
- Auto-closing pairs for
(), [], (**), /**/, '', ""
- Indentation rules for ST block keywords (
if/end_if, etc.)
- Comment toggle with
// (line) and (*..*) (block)
Example
{This is a pragma}
function_block Counter
var_input
Enable : bool;
Step : dint := 1;
end_var
var_output
Value : dint;
end_var
var
_initialized : bool := false;
end_var
if not _initialized then
Value := 0;
_initialized := true;
end_if;
if Enable then
Value := Value + Step;
end_if;
end_function_block
Supported File Extensions
| Extension |
Description |
.iec, .iecst, .st |
IEC 61131-3 source files |
Installation
Install from the VS Code Marketplace, or install a .vsix file directly.
Local Development
Clone the repository and press F5 to launch the Extension Development Host:
git clone https://github.com/yunos0987/vscode-iec-61131-3-lang.git
cd vscode-iec-61131-3-lang
code .
# Then press F5 in VS Code
Alternatively, install a packaged .vsix:
code --install-extension iec-61131-3-<version>.vsix
License
MIT License
Changelog
See CHANGELOG.md.
jiecc — An IEC 61131-3 converter.
Converts IEC 61131-3 source code to IEC 61131-10 XML into a format importable by each manufacturer's PLC tool
(Beckhoff TwinCAT, CODESYS, OMRON, Mitsubishi, etc.).
jieclib — An IEC 61131-3 source code library.
Real-world .iec files you can open directly to see this extension's syntax highlighting in action.
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