1. Safety Chain Monitoring Board ES.02/F Description Monitoring the switch state of the up and down safety chains of the escalator, such as: switching states of upper control cabinet scram button, middle inclined scram button, side comb teeth panel fails, through the CAN action can be realized. communicate through upper left side comb teeth board switch, upper right switch, main drive chain rupture, etc. When any switch communication and main board communication, protect Safety up and down chain fault acquisition boards also CAN, which can greatly save the cables.