SULAB SM.01PA Elevator Main PCB Board with CAN Bus Communication

Elevator Main PCB Board, Main Board, Elevator Main Panel, Elevator Control Board, Elevator Parts PCB Board, Stepper Main Board, Driver Board SM.01PA

The core of the SM.01PA board is "command acquisition + signal conversion + status display." Its specific functions include:

Command acquisition: Receives operation signals from the elevator car, such as the floor selection button, door opening/closing button, and emergency alarm button, converts analog/digital signals into communication signals compliant with the Monarch protocol, and transmits them to the elevator main control board.

Status feedback: Receives information such as "floor position," "travel direction," and "door status (open/close)" from the main control board, and activates the floor display (such as a digital tube/LED screen), direction indicator, and door opening/closing status light in the elevator car, providing passengers with feedback on the current elevator status.

Alarm and fault feedback: If an emergency alarm (such as an alarm button or trapped person signal) is triggered in the elevator car, the SM.01PA transmits the alarm signal to the main control board and may also activate a buzzer or alarm indicator in the elevator car to alert passengers. Communication adaptation: Communicate with the main control board through Monarch dedicated communication bus (such as CAN bus or RS485 bus) to ensure stable transmission of commands and status signals and avoid command loss or delay.

Communication Failure (Most Common)
Symptom: The communication light (COM) is off/steady on/flashing abnormally, car commands cannot be registered (no response to button presses), or the main control board reports "Car Command Board Communication Failure" (such as Monarch fault code E37).
Troubleshooting:
Check the communication bus (CAN-H/CAN-L or RS485-A/RS485-B) for loose or reversed wiring, or damage to the bus cable (e.g., being squeezed by the car door).
Measure the communication bus voltage (normal CAN bus voltage: CAN-H ≈ 2.5-3.5V, CAN-L ≈ 1.5-2.5V, voltage difference ≈ 1V). If the voltage is abnormal, the bus may be short-circuited, grounded, or the communication chip on the board may be damaged.
Try replacing the SM.01PA board with the same model to rule out a problem with the board itself (e.g., a burned-out communication chip).