Electrical Elevator Main Board

Latest MRAM memory technology to save events failures and other data
Lead-acid battery (accumulator) charger
The MCU can run with battery (accumulator) power
Real-time clock
Galvanic power supply separation by four! individual DC/DC converters and numerous optocouplers
complete separation for MCU controller part / CAN1 / CAN2 / RS485
All 16 digital inputs are galvanically isolated by optocouplers
All nine main outputs are galvanically isolated by relays
TUV approved and EN-81 conformable safety line supervision circuitry/layout
Removable memory chips that contain all project specific data in case of MCU damage
Four-layer PCB with internal power supply layers
ICSP interface (in-circuit serial programming)
Two galvanically separated and isolated CAN buses
Galvanically separated and isolated RS485 bus
RS232 bus
Eight digital inputs low-active
Eight free programmable relays outputs (e.g. for collective fault signalling)
One contactor supervision input (220/230V AC 50/60Hz)
Four safety circuit supervision inputs (220/230V AC 50/60 Hz)
Integrated emergency relay
Reverse polarity protection
Separated over current/short circuit protection with Polyswitch fuses for the MCU the Saftey Relays Unit and the electronic car devices
Several supervision LEDs