GetSystemsByBoard

board = UnwrapElement(IN[0])
brdName = board.Name
elSys = board.MEPModel.ElectricalSystems

outlist = list()

##Щит может не содержать систем - нужна проверка
if elSys:
    outlist = [sys for sys in elSys if sys.PanelName == brdName]

OUT = outlist