Traffic light PLC application

System

This simple sequence PLC application allows traffic light control of a cross-road to be implemented on a timed sequence basis. The control program can be further developed to cope with interrupts generated from pedestrian crossing requests or off-peak vehicle detector inputs.

Function

• Real-life application
• Timed sequence control
• Interrupt device control
• Easy to understand process
• Low cost application
• Operates with major PLC types
• Pre-wired or "wire your own" Mitsubishi, Allen Bradley & Siemens PLCs available (supplied separately), or use your own

Topics

• Programming counters
• Setting initial conditions
• Time-based process control
• Use of interrupts & emergency stop