//+------------------------------------------------------------------+
//|                                                        binar.mq4 |
//|                                                 Copyright © 2017 |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2017"
#property link      ""
#property strict
#property description "советник"
#property description "sell при пересечение сверху вниз 90 и на buy снизу вверх 10"
#property description ""
//--------------------------------------------------------------------
extern int     period_RSI           = 4,
               period_MFI           = 4,
               period_DEM           = 4,


               slippage             = 10,
               RSIbuy_level            = 10,
               RSIsell_level           = 90,
               MFIbuy_level            = 0.0,
               MFIsell_level           = 100,
               DEMbuy_level            = 0.0,
               DEMsell_level           = 1.0,
               Magic                = 777;
extern double  Lot                  = 100;
//--------------------------------------------------------------------
void OnTick()
{
   for (int i=0; i<OrdersTotal(); i++)
      if (OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
         if (OrderSymbol()==Symbol() && Magic==OrderMagicNumber()) return;
   double RSI0  = iRSI(NULL,0,period_RSI,PRICE_CLOSE,0);
 //  double RSI1  = iRSI(NULL,0,period_RSI,PRICE_CLOSE,1);
   double MFI0  = iMFI(NULL,0,period_MFI,0);
//   double MFI1  = iMFI(NULL,0,period_MFI,0);   
   double DEM0  = iDeMarker(NULL,0,period_DEM,0);
//   double DEM1  = iDeMarker(NULL,0,period_DEM,0);   
  
 //  Comment("MFI ",MFI0,  "\nRSI ",RSI0, "\nDEM ",DEM0);

   double SL=0,TP=0;
   if (RSI0 < RSIbuy_level && MFI0 == MFIbuy_level && DEM0 == DEMbuy_level && Open[1]>Close[1])
   
   {
 //     if (takeprofit!=0) TP  = NormalizeDouble(Ask + takeprofit*Point,Digits);
 //     if (stoploss!=0)   SL  = NormalizeDouble(Ask - stoploss*  Point,Digits);     
      if (OrderSend(Symbol(),OP_BUY, Lot,NormalizeDouble(Ask,Digits),slippage,0,0,1,Magic)==-1) Print(GetLastError());
   }
   if (RSI0 > RSIsell_level && MFI0 == MFIsell_level && DEM0 == DEMsell_level && Open[1]<Close[1])
   
   
  // if (RSI0 < sell_level && RSI1 > sell_level)
   {
 //     if (takeprofit!=0) TP = NormalizeDouble(Bid - takeprofit*Point,Digits);
 //     if (stoploss!=0)   SL = NormalizeDouble(Bid + stoploss*  Point,Digits);            
      if (OrderSend(Symbol(),OP_SELL,Lot,NormalizeDouble(Bid,Digits),slippage,0,0,1,Magic)==-1) Print(GetLastError());
   }
}
//--------------------------------------------------------------------

datetime t=0;

if(t!=Time[0])
{
...
t=Time[0];
}