AOP-1型列車超速保護裝置，用于實時監測列車運行速度。當列車速度超出設定限速時，將使列車進入緊急制動狀態，從而保證列車運行安全。

本產品提供三種限速模式：正常向前限速模式、正常向后限速模式以及切除限速模式。當列車速度超過設定限速時，該裝置將斷開所有的超速保護觸點，從而導致列車安全環路斷開，產生緊急制動并向TMS（Train Monitoring System）報告有超速保護發生；只有當列車運行速度低于設定的零速限值時，所有的超速觸點才能重新閉合。

    本系統為雙機熱備高可靠性裝置。整個系統由A、B兩組完全獨立的控制單元組成，每組單元由電源模塊、輸入模塊、主機模塊以及輸出模塊組成，各模塊之間通過總線進行連接。其輸入、輸出模塊均采用光電隔離措施，與外部電路實現完全的電氣隔離，從而保證系統安全。

AOP-1 train over speed protection device is used to monitor the train running speed in real time. When the speed of the train exceeds the setting limit speed, the train will enter the emergency braking state, ensuring the safety of the train running.

This product provides three kinds of speed limiting mode: normal forward speed limiting mode, normal backward speed limiting mode, and removal rate speed limiting mode. When the train speed exceeds the setting limit speed, the device will disconnect all over speed protection contacts, causing the train safety loop break off and emergency braking, and report to the TMS (Train Monitoring System) the over speed protection; only when the train speed is less than the setting zero speed limit, all speeding contacts will close again.

The system is a dual machine hot standby high reliability device. The whole system is composed of two groups of completely independent control unit A and B, each unit is composed of power supply module, input module, host module and output module, each module connects through the bus. The input and output module all use the photoelectric isolation measures, realizing complete electrical isolation with the external circuit, and ensuring system security.