stopped = false;
function OnStop()
  stopped = true;
end;
current_time = os.clock()
num = 0
function main()
 function cb( index ) 
  local time = os.clock()
  if time - current_time > 60 then
    current_time = time
    message("Запросов в минуту: " .. num, 1)
    num = 0
  end
  num = num + 1
 end 
 ds = CreateDataSource ("SPBFUT", "SiZ1", INTERVAL_M1) 
 ds:SetUpdateCallback (cb)
 while not stopped do
   sleep(1)
 end
 ds:Close()
end