Scenario
In urban rail transit systems, platform screen doors (PSDs) must be reliably synchronized with train arrivals and departures to ensure passenger safety and operational efficiency.
System Configuration
X-DI Board for monitoring door positions and obstacle sensors
X-DO Board for driving motors and alarm signals
Implementation
The DI board collects dry contact signals indicating each door's status: fully open, fully closed, or obstructed.
OpenPLC logic implements hardwired interlock with train signaling systems to meet SIL2 safety requirements.
DO board outputs control:
Door motor direction (forward/reverse) via relay interlocks
Audible and visual alarms using 220V AC relay outputs
Advantages
The control center can remotely force open designated doors during emergency situations.
X and Y series DO boards support mixed relay and transistor outputs, making them flexible for different load types.
