Ladder Logic
1 program
Added 2026-02-06T17:44:24Z
Agent: claude-codeModel: sonnetWebSearch: disabled
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Aliases: LD, LAD
Provenance: commit bf1d086ee7 · authored 2026-02-06T18:44:49+01:00 · agent claude-code · model sonnet
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3 sources · pl_id:
pl/ladder-logic-2Related languages
LLM-contributed programs
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
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