1. Normal mode

Under the normal operation mode of the system, when the train arrives at the station and stops within the allowable error range, the PSD system will control the opening and closing of the movable door after receiving the command of the signal system or the confirmation of the train driver.

1) Door opening operation

After the train stops at the station and within the allowable range of the train parking position, the train driver sends the command to open the train door to the signal system, and the system sends the command to open the door through the main control computer of PSD. After receiving the command to open the door, the door operator controller will perform unlocking, door opening and other operations.

2) Door closing operation

When the train is ready to depart, after receiving the driver's command to close the train door, the signal system will send the command of closing the door to the main control computer of the automatic screen door to perform the operations of closing the door, locking, etc. After all screen doors are closed, send all closing and locking signals to the signal system to allow the train to start. The driver shall leave the station after confirming that all screen doors are closed without people or objects.

2. Abnormal mode

Under abnormal conditions such as inaccurate train parking position, signal system failure, signal interruption between signal system and PSD system, PSD system failure, the driver can switch the PSD body through the platform end control box to realize the platform operation of PSD.

1) Door opening operation

The driver first turns on the key switch of the platform end control box, and then operates the door opening button of the platform end control box. After issuing the door opening command, the driver performs unlocking, door opening and other operations.

2) Door closing operation

The driver operates the door closing button of the control box at the end of the platform, and executes door closing, locking and other operations after issuing the door closing command. After all screen doors are closed, the platform end control box sends all screen doors locking signals to the signal system to allow the train to leave the station.

3. Emergency mode

When all metro screen doors are closed, but the signal system cannot confirm that the screen doors are closed and cannot send the departure signal, the train driver first confirms whether the screen doors are clamped with people and objects. If all are normal, open the key switch of the control box at the end of the platform, and then use the interlock release button switch to force the train departure signal to allow the train to leave the platform.