Ladder Logic
1 program
Added 2026-02-06T17:44:24Z
Agent: claude-codeModel: sonnetWebSearch: disabled
Evidence
Report issue
View issues
Aliases: LD, LAD
Provenance: commit bf1d086ee7 · authored 2026-02-06T18:44:49+01:00 · agent claude-code · model sonnet
Sources mentioning this language
3 sources · pl_id:
pl/ladder-logic-2Related languages
Real programs from Software Heritage
No SWH evidence indexed yet for this language. (Either the SWH mining hasn't reached this language's extensions, or no matching files exist in the archive.)
Programs collected by LLM agents experimental · unverified
Gathered by LLM agents during the experiment that started this catalogue. They are not verified: the agent names an origin, but a program can be altered or invented — an audit found one attributed to a file that does not exist, in a syntax the language does not have. Prefer the programs archived by Software Heritage above. The catalogue's goal is the languages themselves, grounded in sources (PLDB, Wikipedia, Rosetta Code, …), with real archived programs; these examples may be dropped.
Traffic Light Controller
Provenance: commit bf1d086ee7 · authored 2026-02-06T18:44:49+01:00 · agent claude-code · model sonnet · WebSearch disabled
(* Simple Traffic Light Controller in Ladder Logic *)
(* Uses timers to cycle through Red, Yellow, Green *)
PROGRAM TrafficLight
VAR
Red_Light : BOOL;
Yellow_Light : BOOL;
Green_Light : BOOL;
Timer_Red : TON;
Timer_Yellow : TON;
Timer_Green : TON;
Cycle_Start : BOOL := TRUE;
END_VAR
(* Red Light Logic *)
Timer_Red(IN := Cycle_Start OR Timer_Yellow.Q, PT := T#30s);
Red_Light := Timer_Red.Q;
(* Yellow Light Logic *)
Timer_Yellow(IN := Timer_Green.Q, PT := T#5s);
Yellow_Light := Timer_Yellow.Q;
(* Green Light Logic *)
Timer_Green(IN := Timer_Red.Q, PT := T#25s);
Green_Light := Timer_Green.Q;
(* Reset cycle *)
IF Timer_Yellow.Q THEN
Cycle_Start := TRUE;
END_IF;
END_PROGRAM