The fault acquisition board is used to collect fault points on the safety chain and display them on the fault display board. The acquisition board can be divided into an upper acquisition board and a lower acquisition board. The cable of the switch closest to the upper part of the escalator can be connected to the upper acquisition board, and the cable of the switch closer to the lower part of the escalator can be connected to the lower acquisition board. The connection between them is through CAN communication, which saves cables to the greatest extent. ES.02/B can provide 24 low-voltage signal (24VDC) inputs, and the position of ES.02/B (upper or lower) can be set through the dial switch SW1 ).