host = $host;
}
/**
* __toString
*
* Magic method
*/
function __toString() {
return "" . $this->status . "
";
}
/**
* connect
*
* Connect the socket
*
* @return bool
*/
private function connect(){
// UDP socket
$this->sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
// connect
$result = @socket_connect($this->sock, $this->host, $this->port);
if ($result === false) {
throw new Exception("socket_connect() failed.Reason: ($result)".
socket_strerror(socket_last_error($this->sock)));
} else {
$this->status .= "Connected\n";
return true;
}
}
/**
* disconnect
*
* Disconnect the socket
*/
private function disconnect(){
socket_close($this->sock);
$this->status .= "Disconnected\n";
}
/**
* send
*
* Send the packet via Modbus
*
* @param string $packet
*/
private function send($packet){
socket_write($this->sock, $packet, strlen($packet));
$this->status .= "Send\n";
}
/**
* rec
*
* Receive data from the socket
*
* @return bool
*/
private function rec(){
socket_set_nonblock($this->sock);
$readsocks[] = $this->sock;
$writesocks = NULL;
$exceptsocks = NULL;
$rec = "";
$lastAccess = time();
while (socket_select($readsocks,
$writesocks,
$exceptsocks,
0,
300000) !== FALSE) {
$this->status .= "Wait data ... \n";
if (in_array($this->sock, $readsocks)) {
while (@socket_recv($this->sock, $rec, 2000, 0)) {
$this->status .= "Data received\n";
return $rec;
}
$lastAccess = time();
} else {
if (time()-$lastAccess >= $this->timeout_sec) {
throw new Exception( "Watchdog time expired [ " .
$this->timeout_sec . " sec]!!! Connection to " .
$this->host . " is not established.");
}
}
$readsocks[] = $this->sock;
}
}
/**
* responseCode
*
* Check the Modbus response code
*
* @param string $packet
* @return bool
*/
private function responseCode($packet){
if(($packet[7] & 0x80) > 0) {
throw new Exception("Modbus response error code:" . ord($packet[8]));
} else {
$this->status .= "Modbus response error code: NOERROR\n";
return true;
}
}
/**
* readMultipleRegisters
*
* Modbus function FC 3(0x03) - Read Multiple Registers.
*
* This function reads {@link $quantity} of Words (2 bytes) from reference
* {@link $referenceRead} of a memory of a Modbus device given by
* {@link $unitId}.
*
*
* @param int $unitId usually ID of Modbus device
* @param int $reference Reference in the device memory to read data (e.g. in device WAGO 750-841, memory MW0 starts at address 12288).
* @param int $quantity Amounth of the data to be read from device.
* @return false|Array Success flag or array of received data.
*/
function readMultipleRegisters($unitId, $reference, $quantity){
$this->status .= "readMultipleRegisters: START\n";
// connect
$this->connect();
// send FC 3
$packet = $this->readMultipleRegistersPacketBuilder($unitId, $reference, $quantity);
$this->status .= $this->printPacket($packet);
$this->send($packet);
// receive response
$rpacket = $this->rec();
$this->status .= $this->printPacket($rpacket);
// parse packet
$receivedData = $this->readMultipleRegistersParser($rpacket);
// disconnect
$this->disconnect();
$this->status .= "readMultipleRegisters: DONE\n";
// return
return $receivedData;
}
/**
* fc3
*
* Alias to {@link readMultipleRegisters} method.
*
* @param int $unitId
* @param int $reference
* @param int $quantity
* @return false|Array
*/
function fc3($unitId, $reference, $quantity){
return $this->readMultipleRegisters($unitId, $reference, $quantity);
}
/**
* readMultipleRegistersPacketBuilder
*
* Packet FC 3 builder - read multiple registers
*
* @param int $unitId
* @param int $reference
* @param int $quantity
* @return string
*/
private function readMultipleRegistersPacketBuilder($unitId, $reference, $quantity){
$dataLen = 0;
// build data section
$buffer1 = "";
// build body
$buffer2 = "";
$buffer2 .= iecType::iecBYTE(3); // FC 3 = 3(0x03)
// build body - read section
$buffer2 .= iecType::iecINT($reference); // refnumber = 12288
$buffer2 .= iecType::iecINT($quantity); // quantity
$dataLen += 5;
// build header
$buffer3 = '';
$buffer3 .= iecType::iecINT(rand(0,65000)); // transaction ID
$buffer3 .= iecType::iecINT(0); // protocol ID
$buffer3 .= iecType::iecINT($dataLen + 1); // lenght
$buffer3 .= iecType::iecBYTE($unitId); //unit ID
// return packet string
return $buffer3. $buffer2. $buffer1;
}
/**
* readMultipleRegistersParser
*
* FC 3 response parser
*
* @param string $packet
* @return array
*/
private function readMultipleRegistersParser($packet){
$data = array();
// check Response code
$this->responseCode($packet);
// get data
for($i=0;$istatus .= "writeMultipleRegister: START\n";
// connect
$this->connect();
// send FC16
$packet = $this->writeMultipleRegisterPacketBuilder($unitId, $reference, $data, $dataTypes);
$this->status .= $this->printPacket($packet);
$this->send($packet);
// receive response
$rpacket = $this->rec();
$this->status .= $this->printPacket($rpacket);
// parse packet
$this->writeMultipleRegisterParser($rpacket);
// disconnect
$this->disconnect();
$this->status .= "writeMultipleRegister: DONE\n";
return true;
}
/**
* fc16
*
* Alias to {@link writeMultipleRegister} method
*
* @param int $unitId
* @param int $reference
* @param array $data
* @param array $dataTypes
* @return bool
*/
function fc16($unitId, $reference, $data, $dataTypes){
return $this->writeMultipleRegister($unitId, $reference, $data, $dataTypes);
}
/**
* writeMultipleRegisterPacketBuilder
*
* Packet builder FC16 - WRITE multiple register
* e.g.: 4dd90000000d0010300000030603e807d00bb8
*
* @param int $unitId
* @param int $reference
* @param array $data
* @param array $dataTypes
* @return string
*/
private function writeMultipleRegisterPacketBuilder($unitId, $reference, $data, $dataTypes){
$dataLen = 0;
// build data section
$buffer1 = "";
foreach($data as $key=>$dataitem) {
if($dataTypes[$key]=="INT"){
$buffer1 .= iecType::iecINT($dataitem); // register values x
$dataLen += 2;
}
elseif($dataTypes[$key]=="DINT"){
$buffer1 .= iecType::iecDINT($dataitem, $endianess); // register values x
$dataLen += 4;
}
elseif($dataTypes[$key]=="REAL") {
$buffer1 .= iecType::iecREAL($dataitem, $endianess); // register values x
$dataLen += 4;
}
else{
$buffer1 .= iecType::iecINT($dataitem); // register values x
$dataLen += 2;
}
}
// build body
$buffer2 = "";
$buffer2 .= iecType::iecBYTE(16); // FC 16 = 16(0x10)
$buffer2 .= iecType::iecINT($reference); // refnumber = 12288
$buffer2 .= iecType::iecINT($dataLen/2); // word count
$buffer2 .= iecType::iecBYTE($dataLen); // byte count
$dataLen += 6;
// build header
$buffer3 = '';
$buffer3 .= iecType::iecINT(rand(0,65000)); // transaction ID
$buffer3 .= iecType::iecINT(0); // protocol ID
$buffer3 .= iecType::iecINT($dataLen + 1); // lenght
$buffer3 .= iecType::iecBYTE($unitId); //unit ID
// return packet string
return $buffer3. $buffer2. $buffer1;
}
/**
* writeMultipleRegisterParser
*
* FC16 response parser
*
* @param string $packet
* @return bool
*/
private function writeMultipleRegisterParser($packet){
$this->responseCode($rpacket);
return true;
}
/**
* readWriteRegisters
*
* Modbus function FC23(0x17) - Read Write Registers.
*
* This function writes {@link $data} array at reference {@link $referenceWrite}
* position of memory of a Modbus device given by {@link $unitId}. Simultanously,
* it returns {@link $quantity} of Words (2 bytes) from reference {@link $referenceRead}.
*
*
* @param int $unitId usually ID of Modbus device
* @param int $referenceRead Reference in the device memory to read data (e.g. in device WAGO 750-841, memory MW0 starts at address 12288).
* @param int $quantity Amounth of the data to be read from device.
* @param int $referenceWrite Reference in the device memory to write data.
* @param array $data Array of values to be written.
* @param array $dataTypes Array of types of values to be written. The array should consists of string "INT", "DINT" and "REAL".
* @return false|Array Success flag or array of data.
*/
function readWriteRegisters($unitId, $referenceRead, $quantity, $referenceWrite, $data, $dataTypes){
$this->status .= "readWriteRegisters: START\n";
// connect
$this->connect();
// send FC23
$packet = $this->readWriteRegistersPacketBuilder($unitId, $referenceRead, $quantity, $referenceWrite, $data, $dataTypes);
$this->status .= $this->printPacket($packet);
$this->send($packet);
// receive response
$rpacket = $this->rec();
$this->status .= $this->printPacket($rpacket);
// parse packet
$receivedData = $this->readWriteRegistersParser($rpacket);
// disconnect
$this->disconnect();
$this->status .= "writeMultipleRegister: DONE\n";
// return
return $receivedData;
}
/**
* fc23
*
* Alias to {@link readWriteRegisters} method.
*
* @param int $unitId
* @param int $referenceRead
* @param int $quantity
* @param int $referenceWrite
* @param array $data
* @param array $dataTypes
* @return false|Array
*/
function fc23($unitId, $referenceRead, $quantity, $referenceWrite, $data, $dataTypes){
return $this->readWriteRegisters($unitId, $referenceRead, $quantity, $referenceWrite, $data, $dataTypes);
}
/**
* readWriteRegistersPacketBuilder
*
* Packet FC23 builder - READ WRITE registers
*
*
* @param int $unitId
* @param int $referenceRead
* @param int $quantity
* @param int $referenceWrite
* @param array $data
* @param array $dataTypes
* @return string
*/
private function readWriteRegistersPacketBuilder($unitId, $referenceRead, $quantity, $referenceWrite, $data, $dataTypes){
$dataLen = 0;
// build data section
$buffer1 = "";
foreach($data as $key => $dataitem) {
if($dataTypes[$key]=="INT"){
$buffer1 .= iecType::iecINT($dataitem); // register values x
$dataLen += 2;
}
elseif($dataTypes[$key]=="DINT"){
$buffer1 .= iecType::iecDINT($dataitem, $endianess); // register values x
$dataLen += 4;
}
elseif($dataTypes[$key]=="REAL") {
$buffer1 .= iecType::iecREAL($dataitem, $endianess); // register values x
$dataLen += 4;
}
else{
$buffer1 .= iecType::iecINT($dataitem); // register values x
$dataLen += 2;
}
}
// build body
$buffer2 = "";
$buffer2 .= iecType::iecBYTE(23); // FC 23 = 23(0x17)
// build body - read section
$buffer2 .= iecType::iecINT($referenceRead); // refnumber = 12288
$buffer2 .= iecType::iecINT($quantity); // quantity
// build body - write section
$buffer2 .= iecType::iecINT($referenceWrite); // refnumber = 12288
$buffer2 .= iecType::iecINT($dataLen/2); // word count
$buffer2 .= iecType::iecBYTE($dataLen); // byte count
$dataLen += 10;
// build header
$buffer3 = '';
$buffer3 .= iecType::iecINT(rand(0,65000)); // transaction ID
$buffer3 .= iecType::iecINT(0); // protocol ID
$buffer3 .= iecType::iecINT($dataLen + 1); // lenght
$buffer3 .= iecType::iecBYTE($unitId); //unit ID
// return packet string
return $buffer3. $buffer2. $buffer1;
}
/**
* readWriteRegistersParser
*
* FC23 response parser
*
* @param string $packet
* @return array
*/
private function readWriteRegistersParser($packet){
$data = array();
// if not exception
if(!$this->responseCode($packet))
return false;
// get data
for($i=0;$i> 4) & 0x0F);
$l = dechex($value & 0x0F);
return "$h$l";
}
/**
* printPacket
*
* Print a packet in the hex form
*
* @param string $packet
* @return string
*/
private function printPacket($packet){
$str = "";
$str .= "Packet: ";
for($i=0;$ibyte2hex(ord($packet[$i]));
}
$str .= "\n";
return $str;
}
}
?>