15. Handy Instruction Design Examples 15.3 INCD - Traffic Lights Control (Incremental Drum Sequencer) Vertical direction Horizontal direction Control Purpose: z Performing traffic lights sequence control at the intersection. In both vertical and horizontal directions, the traffic lights are set as the following sequence: Red lights ON for 60s , Yellow lights ON for 3s and green lights ON for 52s and green lights flashing for 5s. z The timing diagrams are as follows: 60s Red Vertical Yellow Green 52s 5s Red 60s Horizontal 3s Yellow Green 52s 5s DVP-PLC Application Examples 15-6 3s