Question

Start Start State 0 Red only Time 2 min State 1 Red + amber Design the traffic light system using SFC, including: SF chart Wiring diagram Assignment list Transitions States Outputs timers Time 20 s State 2 Green only Time 2 min State 3 Amber only + Time 20 s

Answer 1

SF chart

SF chart Step 1 Start Step 2 Redlight Energise Resligud 17. Q0.1) - 1205 Timer Red+Ambert Energise Red lightly.001 Energise Amber tight 7.00.2 205 Timer step 4 Green H uEnergise Greenlight 200:31 Timer - 1205 Step 5 Amber A aos breigise Amber 1Q0.2 Timer End

Wiring Diagram , States and transitions

outouts 7.0 PLC 0.1 0.2 03 04 05 con +SMPS 24V - supply Relay I i|p240 Relay 2 hilpanu 0/1220v Relay 3 palv (padon 3100ماه azov Ducht Amber light Green light Aanbo wiring diagram State o state 1 120 sec 1 20 sec : state 2 stale 31 120sec 20 sec ! %.80.1- Redlights 1.2.0.2. Amberlight 7. Go. 3 Greenlight Scriby Transitions
Outputs:

%Q0.1- Red Light

%Q0.2- Amber Light

%Q0.3- Green Light

Timers:

1- 120 second timer

2- 20 second timer