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How to connect a SD Card to an Industrial Shields Ethernet PLC

 


Introduction


In this example we will see how to connect an SD card to any of our PLCs.


Requirements

 

Ethernet PLC:           MDuino Family Products


How to connect the SD card to our PLC?


First we will start with the connection, next is showed a table and a diagram where you can see how to connect the SD card with the corresponding PLC:



PLCSD CARD
MOSIMOSI
SCKSCK
PIN3CS
CD
MISODO
GND


Software


Next we will see how to configure our PLC to read the SD card.


/*
   SD card test

   This example shows how use the utility libraries on which the'
   SD library is based in order to get info about your SD card.
   Very useful for testing a card when you're not sure whether its working or not.

   The circuit:
  * SD card attached to SPI bus as follows:
 ** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila
 ** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila
 ** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila
 ** CS - depends on your SD card shield or module.

 created  28 Mar 2011
 by Limor Fried
 modified 9 Apr 2012
 by Tom Igoe
 modified 17 Mar 2017
 by Industrial Shields
 */

#include <SD.h>


// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;

// change this to match your SD shield or module;
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
// MKRZero SD: SDCARD_SS_PIN
// Industrial Shields devices: pin 3
const int chipSelect = 53;

/////////////////////////////////////////////////////////////////////
void setup() {
  Serial.begin(115200L);
  Serial.println("microsd started");

  // we'll use the initialization code from the utility libraries
  // since we're just testing if the card is working!
  if (!card.init(SPI_HALF_SPEED, chipSelect)) {
    Serial.println("initialization failed. Things to check:");
    Serial.println("* is a card inserted?");
    Serial.println("* is your wiring correct?");
    Serial.println("* did you change the chipSelect pin to match your shield or module?");
    return;
  } else {
    Serial.println("Wiring is correct and a card is present.");
  }

  // print the type of card
  Serial.print("\nCard type: ");
  switch (card.type()) {
    case SD_CARD_TYPE_SD1:
      Serial.println("SD1");
      break;
    case SD_CARD_TYPE_SD2:
      Serial.println("SD2");
      break;
    case SD_CARD_TYPE_SDHC:
      Serial.println("SDHC");
      break;
    default:
      Serial.println("Unknown");
  }

  // Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
  if (!volume.init(card)) {
    Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
    return;
  }


  // print the type and size of the first FAT-type volume
  uint32_t volumesize;
  Serial.print("\nVolume type is FAT");
  Serial.println(volume.fatType(), DEC);
  Serial.println();

  volumesize = volume.blocksPerCluster();    // clusters are collections of blocks
  volumesize *= volume.clusterCount();       // we'll have a lot of clusters
  volumesize *= 512;                            // SD card blocks are always 512 bytes
  Serial.print("Volume size (bytes): ");
  Serial.println(volumesize);
  Serial.print("Volume size (Kbytes): ");
  volumesize /= 1024;
  Serial.println(volumesize);
  Serial.print("Volume size (Mbytes): ");
  volumesize /= 1024;
  Serial.println(volumesize);
}

////////////////////////////////////////////////////////////
void loop() {

}


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