Pedestrian Crossing

hard

Adds a queued pedestrian request and walk phase to a two-direction traffic light.

What it teaches

Keeps Traffic Light 2-Way’s Enable control, then adds an event queue. A one-shot records one button press, a latch remembers it, and the state machine serves it only after all-red.

Parameters

Tag	Direction	Type	Default	Description
In_Enable	Input	BOOL	0	1 runs the crossing; 0 resets it and shows red in both directions
In_WalkRequest	Input	BOOL	0	Pedestrian push button
Cfg_GreenTime	Input	DINT	3000	Duration of each green phase in milliseconds
Cfg_AmberTime	Input	DINT	1500	Duration of each amber phase in milliseconds
Cfg_AllRedTime	Input	DINT	2000	Duration of each all-red phase in milliseconds
Cfg_WalkTime	Input	DINT	2500	Duration of the walk phase in milliseconds
Out_NSGreen	Output	BOOL	0	North-south green light
Out_NSAmber	Output	BOOL	0	North-south amber light
Out_NSRed	Output	BOOL	0	North-south red light
Out_EWGreen	Output	BOOL	0	East-west green light
Out_EWAmber	Output	BOOL	0	East-west amber light
Out_EWRed	Output	BOOL	0	East-west red light
Out_Walk	Output	BOOL	0	Pedestrian walk signal
Sts_Waiting	Output	BOOL	0	1 while a new walk request is queued

Required behavior

When In_Enable is 0, both directions show red, Out_Walk is 0, and any queued request is cleared.
Without a request, the six traffic phases match Traffic Light 2-Way.
Each 0-to-1 transition of In_WalkRequest queues one request and turns on Sts_Waiting.
A queued request never shortens green or amber. It is served after the next all-red phase.
During the walk phase, both traffic directions stay red and Out_Walk is 1 for Cfg_WalkTime.
Starting a walk clears the queued request. A new press during the walk queues another request for a later gap.
Holding the button does not create repeated requests. The button must be released before another press is counted.