Traffic Light 2-Way

medium

Cycles a two-direction intersection with an all-red safety phase before traffic changes direction.

What it teaches

Keeps Traffic Light Simple’s Enable control, then adds coordination between two directions. The new lesson is the all-red interlock: both directions must close before the other opens.

Parameters

Tag	Direction	Type	Default	Description
In_Enable	Input	BOOL	0	1 runs the cycle; 0 resets it and shows red in both directions
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 safety 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

Required behavior

When In_Enable is 0, both directions show red and the sequence resets to its starting phase.
When In_Enable changes to 1, the cycle starts with north-south green and east-west red.
The six phases repeat in order: NS green, NS amber, all red, EW green, EW amber, all red.
Green phases last Cfg_GreenTime, amber phases last Cfg_AmberTime, and all-red phases last Cfg_AllRedTime.
During every green or amber phase, the other direction is red. During each handover, both directions are red.