Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/examples/example_fc3.php

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<?php
require_once dirname(__FILE__) . '/../Phpmodbus/ModbusMaster.php';
// Create Modbus object
$modbus = new ModbusMaster("192.192.15.51", "UDP");
try {
// FC 3
$recData = $modbus->readMultipleRegisters(0, 12288, 6);
}
catch (Exception $e) {
// Print error information if any
echo $modbus;
echo $e;
exit;
}
// Print status information
echo "</br>Status:</br>" . $modbus;
// Print read data
echo "</br>Data:</br>";
print_r($recData);
echo "</br>";
?>