2 Arduinos on a single 1Wire microlan?

Second half:

 // if the file is available, write to it:
  if (dataFile) {
    dataFile.print(year());
    dataFile.print("-");
    dataFile.print(month());
    dataFile.print("-");
    dataFile.print(day());
    dataFile.print(" ");
    dataFile.print(hour());
    dataFile.print(":");
    dataFile.print(minute());
    dataFile.print(":");
    dataFile.print(second());
    dataFile.print(",");
    dataFile.print(sensors.getTempC(T01));
    dataFile.print(",");
     dataFile.print(sensors.getTempC(T02));
    dataFile.print(",");
     dataFile.print(sensors.getTempC(T04));
    dataFile.print(",");
     dataFile.print(sensors.getTempC(T07));
    dataFile.print(",");
     dataFile.print(sensors.getTempC(T08));
    dataFile.print(",");
     dataFile.print(sensors.getTempC(T09));
    dataFile.print(",");
     dataFile.print(sensors.getTempC(T05));
    dataFile.print(",");
     dataFile.print(sensors.getTempC(T06));
    dataFile.print(",");
    dataFile.print(digitalRead(R01)*-1+1);
    dataFile.print(",");
    dataFile.println(digitalRead(R02)*-1+1);
    dataFile.close();
    
  }  
  // if the file isn't open, pop up an error:
  else {
    Serial.println("error opening .txt file");
}

//ETHERNET webpage output:

Client client = server.available();
  if (client) {
    // an http request ends with a blank line
    boolean current_line_is_blank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        if (c == '\n' && current_line_is_blank) {
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          
//Temp etc readings fow webpage:
          {
            client.print("<h1>Heating Control System Status</h1>");
            client.print("<body style=\"background-color:PowderBlue;\">");
            
            client.print("<table border=\"1\"><tr><td>Outside Temp: </td><td>");
            client.print(sensors.getTempC(T01));
            client.print("</td></tr>"); //end table row
            
            client.print("<tr><td>Downtstairs Hall Temp: </td><td>");
            client.print(sensors.getTempC(T02));
            client.print("</td></tr>"); //end table row
            
            client.print("<tr><td>Centraliser Temp: </td><td>");
            client.print(sensors.getTempC(T04));
            client.print("</td></tr>"); //end table row
            
            client.print("<tr><td>Hot Water Top Temp: </td><td>");
            client.print(sensors.getTempC(T07));
            client.print("</td></tr>"); //end table row
            
            client.print("<tr><td>Hot Water Mid Temp: </td><td>");
            client.print(sensors.getTempC(T08));
            client.print("</td></tr>"); //end table row
            
            client.print("<tr><td>Hot Water Bottom Temp: </td><td>");
            client.print(sensors.getTempC(T09));
            client.print("</td></tr>"); //end table row
            
            client.print("<tr><td>WBS Flow Temp: </td><td>");
            client.print(sensors.getTempC(T05));
            client.print("</td></tr>"); //end table row  
            
            client.print("<tr><td>WBS Return Temp: </td><td>");
            client.print(sensors.getTempC(T06));
            client.print("</td></tr>"); //end table row
            
            client.print("<tr><td>CH Pump Status: </td><td>");
            R01Status = digitalRead(R01);
            if (R01Status = HIGH) {client.print("Off");}
            else client.print("On");
            client.print("</td></tr>"); //end table row
            
            client.print("<tr><td>WBS Pump Status: </td><td>");
            R02Status = digitalRead(R02);
            if (R02Status = HIGH) {client.print("Off");}
            else client.print("On");
            client.print("</td></tr>"); //end table row
            
           delay(1000);
          }
          break;
        }
        if (c == '\n') {
          current_line_is_blank = true;
        } 
        else if (c != '\r') {
          current_line_is_blank = false;
        }
      }
    }
    delay(1);
    client.stop();
  }

//LCD ########

buttonState = digitalRead(buttonPin);  //if button is pushed or not
  
  {if (buttonState == LOW){  //LOW = button pressed
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
    lcd.print("Central = ");
    lcd.print(sensors.getTempC(T04));
    lcd.setCursor(0,1);
    lcd.print("CH Pump = ");
    lcd.print((digitalRead(R01) * -1 +1));
    delay(2000);
    lcd.clear();
    
    lcd.setCursor(0,0);
    lcd.print("HW Top = ");
    lcd.print(sensors.getTempC(T07));
    lcd.setCursor(0,1);
    lcd.print("HW Mid = ");
    lcd.print(sensors.getTempC(T08));
    delay(2000);
    lcd.clear();
  
  lcd.setCursor(0,0);
  lcd.print("WBS = ");
  lcd.print(sensors.getTempC(T06));
  lcd.print(" / ");
  lcd.print(sensors.getTempC(T05));
  lcd.setCursor(0,1);
  lcd.print("WBS Pump = ");
  lcd.print((digitalRead(R02) * -1 +1));
  delay(2000);
  lcd.clear();}
  
  else { //turn of display if button not pressed
  lcd.noDisplay();
  lcd.noBacklight(); 
  }}

}